Question

an incandescent lamp is operated at 240v and the current is 0.5A. what is the resistance of the lamp?​

Answer 1

Explanation:

The answer is indeed 75 ohms

Power (P) = Voltage (V)x Current(I)

substituting for P and V,

200 = 100 x I

I = 2 amps

The resistance of the lamp = V/I = 100/2 = 50 ohms

now the circuit will contain 250 V power supply in series with above lamp and another resistor R and lamp requires 2 amps of current to flow in the circuit. So, we just need to find total resistance for that,

R + 50(resistance of lamp) = V/I = 250/2 = 125 ohms

R + 50 = 125

R = 75 ohms

Answer 2

Answer:

The correct answer pf this question is R = 480Ω

Explanation:

Given - An incandescent lamp is operated at $240$v and the current is $0.5$A.

To Find - Write  what is the resistance of the lamp?​

As the temperature of a lamp's filament rises, so does its resistance. A filament lamp's current is not directly proportional to the voltage across it. Electricity's energy is converted into another form of energy, such as light or heat.

An incandescent lamp which is operated at $240v$

$V=240$ volt,$I = 0.5$A, R = ?

$V = IR$

$R = \frac{V}{I} = \frac{240}{0.5}$

R = $480$ Ω

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