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A torch bulb draws a current of when connected to a battery
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A torch bulb draws a current of
300
mA
300\,\text{mA}
300
mA
when connected to a
4.5
V
4.5\,\text{V}
4.5
V
battery. What is the resistance of the bulb? (a)
150
Ω
150\,\Omega
150
Ω
(b)
1.5
Ω
1.5\,\Omega
1.5
Ω
(c)
15
Ω
15\,\Omega
15
Ω
(d)
45
Ω
45\,\Omega
45
Ω
Related theory
Ohm's Law
Ohm's Law (Macroscopic)
Ohm's law, V-I graphs and ohmic/non-ohmic conductors
Current Electricity
Ohm's law and V-I graphs
Electricity
Electric Circuits
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