Electricity at home: switches, plugs, fuses and alarms
Tests: 8 of 11 right · Exam: 3 of 4 right · Kind: ★ · Understood: 10 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 14 of the technology course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.
Test 1 · ★ · wrong ✗
smoke alarm keeps chirping and it's driving me mad, just yank the battery out?
- 1. Yes, it only really needs a battery at night when you sleep — ← Mova's choice · score 6
- 2. No, never take it out; tell an adult to change it — ✓ the right answer · score 6
- 3. Yes, it's not important — no support
- 4. No, smash it instead — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 14, line 14: «A smoke alarm senses smoke and beeps very loudly; a short chirp every so often means its battery is low, and it should be tested each month with its button; ne…», reached through the remembered sentence the question matched. What matched: the same doer «smoke alarm» (+4); the same thing acted on «battery» (+4). Against it: a different action (counts against) (-2). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics
Test 2 · ★ · right ✓
In a film a boy pokes a fork into a socket and his hair stands up, and he is fine. What's true?
- 1. It is safe with a plastic fork — no support
- 2. Only metal forks are a problem — no support
- 3. It is safe if the light is off — no support
- 4. Never put anything into a socket: mains electricity can kill — ← Mova's choice · ✓ the right answer · score 4
Why: It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 14, line 19: «Never touch switches with wet hands, never put anything into a socket, and hold the plug, not the cable, to pull it out.», reached through the option's own match among the sentences about the question's things. What matched: the same action «put» (+2); the same thing acted on «anything» (+2). · the question and its options parsed, with trees and pragmatics
Test 3 · ★ · right ✓
why does the alarm go off when toast burns lol it's not a fire?
- 1. It senses smoke, and burnt toast makes smoke — ← Mova's choice · ✓ the right answer · score 7
- 2. It feels the kitchen getting warm and thinks it is a fire — score 4
- 3. It hears the toaster pop — no support
- 4. It smells the butter — no support
Why: It took the question to ask why something happens (its cause). It chose option 1 with score 7, against 4 for the next best. Its support: lesson 14, line 14: «A smoke alarm senses smoke and beeps very loudly; a short chirp every so often means its battery is low, and it should be tested each month with its button; ne…», reached through the same lesson line as the sentence the question matched. What matched: the same action «sense» (+3); the same doer «smoke alarm» (+2); the same thing acted on «smoke» (+2). · the question and its options parsed, with trees and pragmatics
Test 4 · ★ · right ✓
My cousin says the fuse in a plug is there to make the plug heavier. Right?
- 1. No, it is to make the plug light up — no support
- 2. No, it melts to cut the power if too much current flows — ← Mova's choice · ✓ the right answer · score 8
- 3. Yes, it is a weight — no support
- 4. Yes, to stop it falling out — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 8, the only option with support. Its support: lesson 14, line 3: «Mains electricity is strong enough to kill, so homes are full of guards: shutters inside sockets, fuses that melt, and switches in the fuse box that cut the po…», reached through the remembered sentence the question matched. What matched: the same action «melt» (+4); the same doer «fuses» (+4). · the question and its options parsed, with trees and pragmatics
Test 5 · ★ · wrong ✗
Which uses more electricity: a kettle, or all the LED lights in a room?
- 1. Neither uses any — no support
- 2. The LED lights — ← Mova's choice · score 3
- 3. The kettle — ✓ the right answer · score 3
- 4. They use exactly the same — no support
Why: It took the question to ask who or what does it. It chose option 2 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 13, line 6: «A boiler burns gas, or uses electricity, to heat water, and a pump sends the hot water round pipes to radiators and taps; gas boilers are fitted by registered…», reached through the remembered sentence the question matched. What matched: the same action «use» (+3); the same thing acted on «electricity» (+3). Against it: a different doer (counts against) (-3). The right option, 3, scored 3. · the question and its options parsed, with trees and pragmatics
Test 6 · ★ · right ✓
What would happen if a frayed wire let electricity leak through someone touching it, in a house with an RCD?
- 1. Nothing at all would change — no support
- 2. The RCD would switch the power off in a split second — ← Mova's choice · ✓ the right answer · score 4
- 3. The meter would stop counting — no support
- 4. The RCD would make the current stronger to push it through — no support
Why: It took the question to ask what happens next. It chose option 2 with score 4, the only option with support. Its support: lesson 14, line 11: «The fuse box, or consumer unit, has circuit breakers that switch off a circuit when too much current flows, and an RCD that switches off in about four hundredt…», reached through the same lesson line as the sentence the question matched. What matched: the same action «switch off» (+2); the same doer «rcd» (+2). · the question and its options parsed, with trees and pragmatics
Test 7 · ★ · right ✓
The carbon monoxide alarm is beeping. What do you do?
- 1. Get out and tell an adult to call for help — ← Mova's choice · ✓ the right answer · score 12
- 2. Go back to sleep, it's most likely a false alarm — no support
- 3. Open the fridge to cool the gas — no support
- 4. Sniff around for the smell — no support
Why: It took the question to ask what is done. It chose option 1 with score 12, the only option with support. Its support: lesson 14, line 14: «A smoke alarm senses smoke and beeps very loudly; a short chirp every so often means its battery is low, and it should be tested each month with its button; ne…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same action «tell» (+4); the same receiver «adult» (+2); a different doer (counts against) (+1). · the question and its options parsed, with trees and pragmatics
Test 8 · ★ · right ✓
ugh my hands are wet, can I just flick the light on?
- 1. No, dry your hands first — ← Mova's choice · ✓ the right answer · no support
- 2. No, but you can use your elbow — no support
- 3. Yes, if you use one finger — no support
- 4. Yes, light switches are waterproof — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 9 · ★ · right ✓
Leo yanks the plug out by its cable. What is the rule?
- 1. It's fine if you pull fast — no support
- 2. Hold the plug, not the cable — ← Mova's choice · ✓ the right answer · score 10
- 3. Pull with two hands on the cable — no support
- 4. Wiggle the cable side to side — no support
Why: It took the question to ask what it is done to. It chose option 2 with score 10, the only option with support. Its support: lesson 14, line 19: «Never touch switches with wet hands, never put anything into a socket, and hold the plug, not the cable, to pull it out.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same thing acted on «plug» (+3); the same action «hold» (+2). · the question and its options parsed, with trees and pragmatics
Test 10 · ★ · wrong ✗
Why does a doorbell camera ring the phone even before the button is pressed?
- 1. It is connected to the street lights outside the house — ← Mova's choice · no support
- 2. It sensed someone moving near the door — ✓ the right answer · no support
- 3. It guesses when visitors come — no support
- 4. It hears footsteps from far away — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 11 · ★ · right ✓
Mum says she pays for electricity in kilowatt-hours. What counts them?
- 1. The fuse box — score 7
- 2. The Wi-Fi router — no support
- 3. The smoke alarm — no support
- 4. The electricity meter — ← Mova's choice · ✓ the right answer · score 11
Why: It took the question to ask who or what does it. It chose option 4 with score 11, against 7 for the next best. Its support: lesson 14, line 13: «The electricity meter counts how much the home uses in kilowatt-hours, and a smart meter sends the reading automatically; a kettle uses more power than a whole…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same action «count» (+3); the same doer «electricity meter» (+3). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the function of the fuse contained within a United Kingdom mains plug.
- 1. It stores electrical energy for later use — ← Mova's choice · no support
- 2. It melts so as to interrupt an excessive current — ✓ the right answer · no support
- 3. It records the energy consumed by the appliance — no support
- 4. It increases the voltage supplied to the appliance — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 2 · formal language · right ✓
It is given that a residual current device detects a leakage of current through a person. State the response of the device.
- 1. It disconnects the supply within a fraction of a second — ← Mova's choice · ✓ the right answer · no support
- 2. It increases the current to the circuit — no support
- 3. It sounds an alarm but leaves the supply connected — no support
- 4. It records the event and takes no further action — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
Which of the following statements most accurately characterises carbon monoxide?
- 1. A harmless gas with a strong smell of rotten eggs — no support
- 2. A visible grey smoke from burning food — no support
- 3. A poisonous gas without colour, odour or taste — ← Mova's choice · ✓ the right answer · score 11
- 4. A gas produced only by electric heaters — no support
Why: It took the question to ask who or what does it. It chose option 3 with score 11, the only option with support. Its support: lesson 11, line 16: «When the knob of a gas cooker is turned, a spark lights the gas; natural gas has no smell of its own, so a smell is added to make leaks easy to notice.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «natural gas» (+3); the same thing acted on «smell» (+3). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · right ✓
Select the response consistent with the established facts concerning the intermittent chirp of a smoke alarm.
- 1. It indicates that the battery requires replacement — ← Mova's choice · ✓ the right answer · no support
- 2. It indicates that the alarm has become fully charged — no support
- 3. It indicates that a fire is in progress — no support
- 4. It indicates that the alarm should be removed — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/technology/14-electricity-at-home/