Bella Dunn
1. What is electric current?
A flow of electrical charge
2. What determines the size of the electric current?
The rate of flow of the electric charge
3. What is the unit of charge flow?
The coulomb (C)
4. What is needed for an electrical charge to flow in a closed circuit?
A source of potential difference
7. What two things does the current (I) through a component depend upon?
The resistance (R) of the component and…
• The potential difference (V) across the component
8. Which equation is used to calculate potential difference?
Potential difference (V) = current (A) x resistance ( ) [V = I R
What is the rule for current in a series circuit?
In a series circuit: the current is the same through each component in the circuit