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Question

If two resistors with resistance 5 Ω and 10 Ω respectively , are connected to a battery of emf 6V, then determine the strength of the total resistance and current in the circuit when connected in
(a) parallel combination and (b) series combination

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Solution

Given,
Two resistors with resistances,
R1=5 Ω
R2=10 Ω
Voltage, V=6 V

In parallel combination,
Equivalent resistance, Rp
1Rp=1R1+1R2

Rp=R1R2R1+R2

Rp=5×105+10=3.33Ω

Current, Ip=VRp

Ip=63.33

Ip=1.80A

In series combination,
Rs=R1+R2
Rs=5+10
Rs=15Ω

Current, Is=VRs

Is=615

Is=0.4A

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