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.