Electricity

Question 1

What is the equation to work out potential difference relating to current and resistance?

Answer 1

V=IR

Question 2

What’s the equation relating charge, current and time?

Answer 2

Q=IT

Question 3

What’s the equation relating work, charge and potential difference?

Answer 3

W=QV

Question 4

What are the circuit rules?

Answer 4

Series circuit rules:

• current is the same at any point.
• the potential difference across the supply is shared between the components of the circuit.
• the resistance of the whole series circuit is the sum of the resisters of its components.

Parallel circuits:

• in a parallel circuit the current will split at a ‘junction’. The total current at a junction must be equal to the total current out.
• the potential difference is equal to the supply.