A torch lamp takes a current of 0.3 A from a 3 V battery. Calculate its resistance.
V = 3 V
I = 0.3 A
R = 10
The resistance of the lamp is 10
Calculate the reading on the ammeter in the circuit shown below.
V = 12.0 V
R = 2.7 x 103
I = 0.0044 A = 4.4 x 10-3 A = 4.4 mA
The reading on the ammeter is 4.4 mA.
3 A flows through a 240 V lamp. What is the resistance of the lamp?
V = 240 V
I = 3 A
R = 80
The resistance of the lamp is 80