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 ▸How to remember what is Ideal Gas Law?
Why is the nuclear model better than the plum pudding model of the atom?
What is meant by terminal velocity?
A boy kicks a ball and it is accelerated uniformly from rest so that after 10 seconds it has achieved a speed of 15m/s. Find the ball's acceleration.