Choose any electric/electronic device and find out its power rating and its oper

Question

Choose any electric/electronic device and find out its power rating and its operating voltage. The power rating is the amount of wattage that the device is supposed to use. The operating voltage depends on the power supply. If it's a battery, then the operating voltage is the voltage of the battery; if it's a household device, the operating voltage is 120 Volts.

a) What is the current drawn from the power supply. (This is the operating current.)

b) What is the equivalent resistance of the device? (Assume a simple circuit)

c) How much energy is used during normal operation? If it's a battery powered device, how much energy is used in a normal cycle (number of hours before you recharge). If it's a home device, how much energy is used if you run the device for 4 hours?

Explanation / Answer

Operating voltage (V) for the household's device = 120 V (a) THen the operating current is calculated as                     I = P / V Here P is the power, which depends upon the device we are using (b) Resistance of the device is calculated as               P = V2 / R               R = V2 / P (c) Amount of energy is used is           W = VIt, Here t = 4 hrs            = 4(3600 s)            = 14400 s

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