Question
Physics Question on Current electricity
A 5-A fuse wire can withstand a maximum power of 1W incircuit.The resistance of the fuse wire is:
A
0.02 Ω
B
0.2 Ω
C
0.4 Ω
D
0.04 Ω
Answer
0.04 Ω
Explanation
Solution
Given: 1 W of power, 5 I of current A resistance (R)
The rate at which energy flows through a resistor determines its power. The limiting energy flow after which the resistor (or wire in this case) would fuse is maximum power.
We are aware of this because P=I2RR= I2 P=25A2 1W=0.04