AQA GCSE Physics Unit 2.5

Question 1 of 20

1

True or false? In alternating current, the potential difference switches between positive and negative values.

Select one of the following:

True
False

Explanation

Question 2 of 20

1

Which of these statements are true about the UK mains supply?

Select one or more of the following:

Frequency of 50Hz
Frequency of 60Hz
Peak voltages of +230 and -230V
Peak voltages of +325 and -325V
Direct voltage of 230V
Direct voltage of 325V

Explanation

Question 3 of 20

1

True or false? The device used to show how alternating potential difference varies with time is called a voltascope.

Select one of the following:

True
False

Explanation

Question 4 of 20

1

What is the peak voltage of an AC supply whose peak is 3.4cm from the centre and whose Y-gain control is 0.75V/cm?

Select one of the following:

2.55V
4.53V
4.15V
2.65V

Explanation

Question 5 of 20

1

What is the frequency of an AC supply if the length of one cycle is 4cm and the time-base control is 15ms/cm?

Select one of the following:

60Hz
0.06Hz
16.67Hz
0.02Hz

Explanation

Question 6 of 20

1

What colour cable is the live wire in a three-core cable?

Select one of the following:

Green and yellow
Brown
Blue

Explanation

Question 7 of 20

1

What colour cable is the neutral wire in a three-core cable?

Select one of the following:

Green and yellow
Brown
Blue

Explanation

Question 8 of 20

1

What colour cable is the earth wire in a three-core cable?

Select one of the following:

Green and yellow
Brown
Blue

Explanation

Question 9 of 20

1

True or false? Appliances with plastic cases such as hairdryers only need two-core cable as they are doubly-insulated and do not need to be earthed.

Select one of the following:

True
False

Explanation

Question 10 of 20

1

True or false? A circuit breaker is a piece of metal that melts if the current flowing through it is too large.

Select one of the following:

True
False

Explanation

Question 11 of 20

1

What fuse would you need to buy if an appliance drew 2.7A of current?

Select one of the following:

1A
2A
3A
5A
13A

Explanation

Question 12 of 20

1

True or false? Residual current circuit breakers break if the current in the live wire is different to the current in the neutral wire.

Select one of the following:

True
False

Explanation

Question 13 of 20

1

Which of these equations connecting power, energy and time is correct?

Select one of the following:

P = E/t
P = t/E
P = Et

Explanation

Question 14 of 20

1

Which of these equations connecting power, current and potential difference is correct?

Select one of the following:

P = I/V
P = V/I
P = IV

Explanation

Question 15 of 20

1

What fuse would I buy if I bought a 230V, 1000W appliance?

Select one of the following:

1A
2A
3A
5A
13A

Explanation

Question 16 of 20

1

How many units of charge would each electron carry if they carried 6A of current in 1 minute?

Select one of the following:

10C
0.1C
360C

Explanation

Question 17 of 20

1

True or false? The equation connecting charge, potential difference and energy is Q = VE.

Select one of the following:

True
False

Explanation

Question 18 of 20

1

What would be the potential difference of circuit in which 2000J of energy were carried by electrons with a charge of 4C?

Select one of the following:

8000V
500V
0.002V

Explanation

Question 19 of 20

1

	Created by Matthew T over 10 years ago

Twenty questions on the fifth section of Unit 2 in AQA GCSE Physics: Mains electricity.

AQA GCSE Physics Unit 2.5

Question 1 of 20

True or false? In alternating current, the potential difference switches between positive and negative values.

Select one of the following:

Explanation

Question 2 of 20

Which of these statements are true about the UK mains supply?

Select one or more of the following:

Explanation

Question 3 of 20

True or false? The device used to show how alternating potential difference varies with time is called a voltascope.

Select one of the following:

Explanation

Question 4 of 20

What is the peak voltage of an AC supply whose peak is 3.4cm from the centre and whose Y-gain control is 0.75V/cm?

Select one of the following:

Explanation

Question 5 of 20

What is the frequency of an AC supply if the length of one cycle is 4cm and the time-base control is 15ms/cm?

Select one of the following:

Explanation

Question 6 of 20

What colour cable is the live wire in a three-core cable?

Select one of the following:

Explanation

Question 7 of 20

What colour cable is the neutral wire in a three-core cable?

Select one of the following:

Explanation

Question 8 of 20

What colour cable is the earth wire in a three-core cable?

Select one of the following:

Explanation

Question 9 of 20

True or false? Appliances with plastic cases such as hairdryers only need two-core cable as they are doubly-insulated and do not need to be earthed.

Select one of the following:

Explanation

Question 10 of 20

True or false? A circuit breaker is a piece of metal that melts if the current flowing through it is too large.

Select one of the following:

Explanation

Question 11 of 20

What fuse would you need to buy if an appliance drew 2.7A of current?

Select one of the following:

Explanation

Question 12 of 20

True or false? Residual current circuit breakers break if the current in the live wire is different to the current in the neutral wire.

Select one of the following:

Explanation

Question 13 of 20

Which of these equations connecting power, energy and time is correct?

Select one of the following:

Explanation

Question 14 of 20

Which of these equations connecting power, current and potential difference is correct?

Select one of the following:

Explanation

Question 15 of 20

What fuse would I buy if I bought a 230V, 1000W appliance?

Select one of the following:

Explanation

Question 16 of 20

How many units of charge would each electron carry if they carried 6A of current in 1 minute?

Select one of the following:

Explanation

Question 17 of 20

True or false? The equation connecting charge, potential difference and energy is Q = VE.

Select one of the following:

Explanation

Question 18 of 20

What would be the potential difference of circuit in which 2000J of energy were carried by electrons with a charge of 4C?

Select one of the following:

Explanation

Question 19 of 20

True or false? Connecting too many appliances to a single socket can lead to overheating.

Select one of the following:

Explanation

Question 20 of 20

Which of these are considered energy-efficient bulbs?