The potential difference in a circuit is 5V. There are two resistors connected in series of resistance 10 Ohms. Calculate the current I in the circuit.
Ohm's law states that V=IR ; where V is p.d., I is current and R is resistance.
Firstly the two resistors are in series so the total resistance is just the sum of the two resistances. Therefore R = 10+10 = 20 Ohms.
The potential difference V is 5V.
By rearranging Ohm's law for the current I, I=V/R the current can be found by 5/20 = 0.25A
RS
Related Physics GCSE answers
All answers ▸What is constant acceleration?
What is induced in the core of a transformer
A baseball player strikes a ball with an initial velocity of 43ms^-1 at an angle of 32° to the horizontal. How far does the ball travel horizontally in 4 seconds?
If a race car completed a full lap and is where he started, why is his average velocity zero but his average speed isn’t?