A lightbulb uses energy at a rate of $25.0 W a t t s$ .
If the current through the lightbulb is $2.00 A$ . What is the resistance of the bulb?

6.25 o h m

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12.5 o h m

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0.0800 o h m

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50.0 o h m

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100.0 o h m

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Solution

The correct option is A $6.25 o h m$
Power of the light bulb $P = 25.0$ Watts
Current through the bulb $I = 2.00$ Amperes

$∴$ Resistance of the bulb $R = \frac{P}{I^{2}} = \frac{25.0}{(2.00)^{2}} = 6.25$ ohm

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A lightbulb uses energy at a rate of 25.0Watts.If the current through the lightbulb is 2.00A. What is the resistance of the bulb?

The correct option is A 6.25 ohmPower of the light bulb P=25.0 WattsCurrent through the bulb I=2.00 Amperes∴ Resistance of the bulb R=PI2=25.0(2.00)2=6.25 ohm

A lightbulb uses energy at a rate of $25.0 W a t t s$ .
If the current through the lightbulb is $2.00 A$ . What is the resistance of the bulb?

The correct option is A $6.25 o h m$
Power of the light bulb $P = 25.0$ Watts
Current through the bulb $I = 2.00$ Amperes

$∴$ Resistance of the bulb $R = \frac{P}{I^{2}} = \frac{25.0}{(2.00)^{2}} = 6.25$ ohm