Electricity and Circuits

Question 1

Which sub-atomic particle flows in an electric current?

Answer 1

Electron

Question 2

Where do you place an ammeter and voltmeter in a circuit?

Answer 2

Ammeter - In series

Voltmeter - In parallel

Question 3

What is the equation linking charge, current and time?

Answer 3

Charge = current x time
Q = I x t

Question 4

What is the equation linking energy transferred, charge moved and potential difference?

Answer 4

Energy transferred =
charge moved x potential difference
E = Q x V

Question 5

What is the equation linking potential difference, current and resistance (Ohm’s Law)

Answer 5

Potential difference = current x resistance

V = I x R

Question 6

What is the equation linking energy transferred, current, potential difference and time?

Answer 6

Energy transferred = current x potential difference x time

E = I x V x t

Question 7

What is the equation linking power, energy transferred and time?

Answer 7

Power = energy transferred / time
P = E / t

Question 8

What is the equation linking electrical power, current and potential difference?

Answer 8

Electrical power = current x potential difference

P = I x V

Question 9

What is the equation linking electrical power, current and resistance?

Answer 9

Electrical power = current squared x resistance

P = I2 x V

Question 10

Why is an Earth wire needed in a plug?

Answer 10

It connects the metal parts to the ground

To carry the current if a fault occurs.