3AT ch 1 revision test

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 3

Lessonup.app

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short circuit or circuit overload?

1. short circuit
2. circuit overload

The two standard units used for energy are..

1. Joules and kJ
2. kW and Joules
3. kWh and Joules
4. kWh and Watts

Which fact is wrong

1. A is current per second
2. U is energy per charge
3. I is charge per second
4. P is joules per second

25 mA is..

1. 0.25 A
2. 0.025 A
3. 250 A
4. 2.5A

When extra bulbs are connected in .....................
the current decreases

1. series
2. parallel

A set of christmas tree lights is connected in series, if one bulb blows. (breaks), then .....

1. the rest will glow brighter
2. the rest will glow the same as before
3. only the bulbs after the broken bulb will light up
4. none of the bulbs will light up

How much energy does a 25W bulb use in one day?

1. 600 kWh
2. 0.125kWh
3. 0.6 kWh
4. 1 kWh

1 kWh costs €0.22
how much does it cost to use a 350 W playstation for 2 hours?

1. €1.54
2. €0.154
3. €15.4
4. €0.0154

How many joules does the 350 W playstation use in the 2 hours?

1. 2.52 MJ
2. 2.52 kJ
3. 700 J
4. 7.0 kJ

The resistance of a wire ...................
with thickness.

1. increases
2. decreases

What is the total
resistance in this
circuit?

1. 10 ohms
2. 10 Volts
3. 5 ohms
4. 3 ohms

What is the current through each resistor if the power supply is 12 V?

1. 1.5 A
2. 3 A
3. 0.33 A
4. 0.66 A

Which kind of meter is connected into the circuit so that the current flows through the meter?

1. resistance meter
2. voltmeter
3. ammeter
4. multimeter

When too many appliances are connected to a socket, the fuse will switch the current off.

1. true
2. false

Due to the electricity being split over groups in an electric installation, more appliances can be connected.

1. true
2. false

Most of the fuse groups in our home consumer unit (meterkast) can handle max current of

1. 3A
2. 1A
3. 16A
4. 230V

The maximum power for a group in a fuse box is found using P = U x I

1. true
2. false

What is the maximum power supported by a 16A fuse in a 220V mains circuit?

1. 13.75W
2. 0.073 W
3. 352 W
4. 3 520 W

When more appliances are connected to one electric socket, the current in each appliance becomes less.

1. true
2. false

A fuse is a safety feature to prevent a high current flowing through your body.

1. True
2. False

Thi

1. This plug is earthed
2. This plug is not earthed

How do you feel now??

1. ready for the test!!
2. getting there!
3. Oh dear, need more revision

Too many appliances plugged into one socket can cause.

1. lights to go dim
2. overload
3. short circuit

For a 16 amp fuse the maximum power is 16kWh

1. true
2. false

An earth leakage circuit breaker protects you from electric currents through your body

1. True
2. False

What colour is the earth wire?

1. green/yellow
2. brown
3. blue

What colour is the live wire?

1. green/yellow
2. brown
3. blue

the blue wire is the ..

1. earth
2. neutral
3. live

If the plastic coating on a wire is damaged this can cause

1. a short circuit
2. overload
3. sparking danger

Houses are equipped with fuses to protect it from short circuits and overloads.

1. true
2. false

The electric wires going to a light fitting, heat up a bit when in use.

1. true
2. false