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A 100 V battery is connected across a resistor and causes a current of 5mA to flow. Determine
the resistance of the resistor. If the voltage is now reduced to 25 V, what will be the new value
of the current flowing?

Respuesta :

asuwafohjames

Answer:

R = 20000 ohms

I = 1.25 mA

Explanation:

From the question,

V = IR................... Equation 1

Where V = Voltage, I = Current, R = Resistance.

Make R the subject of the equation

R = V/I............... Equation 2

Given: V = 100 V, I = 5 mA = 0.005 A

Substitute into equation 2

R = 100/0.005

R = 20000 ohms.

If the Voltage is reduced to 25 V,

I = V/R.................. Equation 3

Given: V = 25 V, R = 20000 ohms.

Substitute these values into equation 3

I = 25/20000

I = 1.25 mA

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