Question

10.The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V. What is the value of current when the voltage across the resistor is 8 V *

1 point

A.0.8 A

B.8 A

C.80 A

D.18 A​

Answer 1

Explanation:

Resistance= voltage/current

R= 10/1 = 10 ohms.

now current= voltage/resistance

i= 8/10

=0.8A

Answer 2

Given: The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V.

To find: The value of current when the voltage across the resistor is 8 V.

Solution:

• The ratio of the potential difference to the current is called the electric resistance of the conductor.

        $R = \frac{V}{I}$

• Here, R is the resistance, V is the voltage and I is the current in the resistor.

• For the voltage 10 volt and current 1 ampere, the resistance is,

        $R = \frac{10V}{1A}$

            $= 10 ohms$

• So, for the voltage 8 volt, the current can be calculated as,

        $10ohms = \frac{8V}{I}$

• On rearranging and solving further, the value of I is found to be,

        $I = \frac{8V}{10ohms}$

           $= 0.8 A$

Therefore, the value is current is 0.8 A when the voltage across the resistor is 8 V.