A 20 Ohm lamp and a 5 Ohm lamp are connected in series and placed across a potential difference of 50 V. What is the equivalent resistance of the circuit?
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We know, in a series combination of electrical appliances, the equivalent resistance is equal to the some of all the resistances of the appliances.
R1=20 ohm
R2=5ohm
R=R1+R2
R=20+5
R=25 ohm
Hence, the equivalent resistance is 25 ohm.
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