Question

the resistance of a device is 100 ohm find the current through it when a potential difference of 20 V is applied across it . to past the same current through a device having resistance 20 ohm how much potential difference should be applied across it ? plz answer correct one...












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Answer 1

Answer:

Q. An electric lamp of resistance 20Ω and a conductor of resistance 4Ω are connected to a 6V battery as shown in the circuit. Calculate:

(a) The total resistance of the circuit

(b) The current through the circuit

(c)The potential difference across the (i) Electric lamp and (ii) Conductor, and

(d) Power of the lamp

Ans: verified

Verified by Toppr

a). the total resistance of the circuit =20Ω+4Ω=24Ω

b). The current through the circuit= current through the bulb= current through the conductor.

The current through the circuit=

Total Resistance

voltage applied

.

the current through the circuit =

24

6

amp

The current through the circuit = 0.25amp

c). The potential difference across the lamp and the conductor.

(i) The potential difference across the electrical lamp =0.25×20=5volt

(ii) The potential difference conductor =0.25×4=1 volt

d). Power can be calculated as

current through the lamp

voltage across the lamp

power=

0.25

5

→20W.

Explanation:

I hope it's help you