A voltmeter connected to a burning electric incandescent lamp shows 120V, and an ammeter shows the current in the lamp 0.08 A. What is the resistance of this lamp?
U = 120 Volts – the voltage of the electric lamp according to the readings of the voltmeter;
I = 0.08 Ampere – the current in the electric lamp according to the ammeter readings.
It is required to determine the resistance of the electric lamp R (Ohm).
To determine the resistance of an electric lamp, you need to use the following formula (Ohm’s law):
U = I * R, hence:
R = U / I = 120 / 0.08 = 1500 ohms.
Answer: the resistance of the electric lamp is 1500 Ohm (1.5 kOhm).
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