Question

(1) Find the equivalent resistance across the two ends A and B of this 5

circuit.

(ii) When do we say that the potential difference across a conductor iss1

volt?

(iii) Which uses more energy, a 250W TV set in one hour or a 1200 W

Toaster in 10 minutes.​

Answer 1

Answer:

1. ii. the potential difference across a conductor is said to be 1 volt when the work done in carrying a unit positive charge from one point to the other is 1 joule.

iii. Energy consumed by the TVset = 250*3600 =9*105J ∴ Energy consumed by a toaster = 1200 × 600 = 7.2× 105J ∴ the energy consumed by a 250 W TV set in 1 h is more than the energyconsumed by a toaster of power 1200 W in 10 minutes.

1. The equivalent resistance across the two ends A and B of the above circuit is 2Ω. Explanation: Let the resistors in the upper traingle be R1=4Ω, R2=2Ω and R3=2Ω.

Answer 2

Answer:

Answer 1: The equivalent resistance across the two ends A and B of the above circuit is 2Ω. Explanation: Let the resistors in the upper traingle be R1=4Ω, R2=2Ω and R3=2Ω.

Answer 2: Potential Difference across a conductor is said to be 1 volt if 1 Joule of work is done in bringing 1 Coulomb from one point to another in a conductor. It is measured by the device known as voltmeter.

Answer 3: Energy consumed by the TVset = 250*3600 =9*105J ∴ Energy consumed by a toaster = 1200 × 600 = 7.2× 105J ∴ the energy consumed by a 250 W TV set in 1 h is more than the energyconsumed by a toaster of power 1200 W in 10 minutes.

Explanation:

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