(a)
According to ohm's law,
Current through a electrical circuit due to voltage,V aplied through a an electrical resistance R is,
I= V/R
Given,
Voltage, V = 120 volt.
Resistance,R = 40 ohm
So, current in the circuit, I = V / R = 120/40 = 3 ampeare.
(b)
Now,
Power in a circuit due to current flow I and voltage applied V is,
P = IV
= 3 × 120 = 360 Watt.
So power in the circuit is 360 Watt.
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resistance through entire circuit = 4 ohms
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