Question

In a circuit the ammemeter reads 5A and Voltmeter reads 20V. The correct value of resistance will be

Answer 1

Answer:

Given: Readings of ammeter = 5A

Readings of voltmeter = 20V

To find : Resistance

Concept:

What is resistance?

Resistance is a property of a conductor by the virtue of which it opposes the flow of electric current.

Formulas used :

Let voltage be "V", Current be "i"

Then resistance R = (V/i)

Calculation:

As per the given data,

R = Voltmeter reading/ammeter reading

=> R = 20/5 = 4 ohms.

So the resistance is 4 ohms.

Assumptions:

1. The ammeter and voltmeter are ideal .

2. The battery does not have any internal resistance.

Answer 2

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The resistance is 4 ohms

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Given:

Readings of ammeter = 5A

Readings of voltmeter = 20V

To find :

• Resistance

$\sf{Concept:}$

What is resistance?

Resistance is a property of a conductor by the virtue of which it opposes the flow of electric current.

Formulas used :

Let voltage be "V", Current be "i"

Then resistance

$\huge \sf{ \: r = \frac{v}{i}}$

$\sf{Calculation:}$

As per the given data,

R = Voltmeter reading/ammeter reading

=> R = 20/5 = 4 ohms.

So the resistance is 4 ohms.