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Question

Calculate the electric current flowing through the 20.5 Ω resistor in the following circuit.

A
1.366 A
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B
0.366 A
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C
2.366 A
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D
3.366 A
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Solution

The correct option is B 0.366 A
Given:
Source voltage, V=7.98 V
Resistor 1, R1=20.5 Ω
Resistor 2, R2=1.3 Ω
Effective resistance in series, Reff=R1+R2
Reff=20.5+1.3=21.8 Ω
In series combination, the same current flows through all the resistors. So, the current through the resistor R1 is the same as the total current in the circuit.
Current, I=VReff=7.9821.8=0.36605 A.

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