Question

1. Typical household currents are on the order of a few amperes.

a. If a 1.54A current flows through the leads of an electrical appliance, how many electrons per second pass through it?

b. If a 1.54A current flows through the leads of an electrical appliance, how many coulombs pass through it in 5.50 min?

c. If a 1.54A current flows through the leads of an electrical appliance, how long does it take for 7.24C of charge to pass through?

d. A copper transmission cable 170km long and a 12.5cm in diameter carries a current of 135 A. What is the potential drop across the cable?

Answer 1

1.a.

1 Ampere is defined as 1 coulomb of charge per sec

Coulomb = no. of electrons*charge of an electron

ANSWER:

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b. If a 1.54A current flows through the leads of an electrical appliance, how many coulombs pass through it in 5.50 min?

ANSWER:

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c. If a 1.54A current flows through the leads of an electrical appliance, how long does it take for 7.24C of charge to pass through?

So

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ANSWER:

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d. A copper transmission cable 170km long and a 12.5cm in diameter carries a current of 135 A. What is the potential drop across the cable?

First find resistance of copper wire

Use Formula

Resistivity of Copper,

Radius ,

Length,

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Use formula

ANSWER:

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