John performs an experiment on an electric circuit. He increases the voltage from 25 volts to 50 volts while keeping the resista

Question

3 years ago

10

nce constant. What will be the effect of John's changes on the current?

1 answer:

Marta_Voda [28] · Answer 1 · 2022-09-11T21:39:00+03:00

The current will double

Explanation:

The relationship between voltage and current in an electric circuit is given by the following equation (Ohm's law):

$V=IR$

where

V is the voltage

I is the current

R is the resistance

making R the subject,

$R=\frac{V}{I}$

Since in this experiment the resistance is kept constant, we can write:

$\frac{V_1}{I_1}=\frac{V_2}{I_2}$

where

$V_1=25 V$ is the voltage in the 1st experiment

$V_2=50 V$ is the voltage in the 2nd experiment

$I_1,I_2$ are the currents in the 1st and 2nd experiment

We can re-arrange the equation as

$\frac{I_2}{I_1}=\frac{V_2}{V_1}=\frac{50}{25}=2$

This means that the current will double in the 2nd experiment.

Learn more about current and voltage:

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