A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally

Assessment: JAMB UTME - Physics - 2018 Subject: Physics

Question 1 Report

A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally
Answer Details
To calculate the voltage needed for a 40W instrument with a resistance of 90 Ohms, we can use the formula: Voltage = √(Power x Resistance) Plugging in the given values, we get: Voltage = √(40W x 90Ω) Voltage = √(3600) Voltage = 60V Therefore, the instrument should be operated at 60V to generate 40W of power with a resistance of 90 Ohms. The correct answer is, 60V.
Read lesson note on Current Electricity (JAMB)
Read lesson note on Simple A.C Circuits (JAMB)
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