A 2.2 k ohm resistor in a stereo system dissipates 42 mw or power. What is the v

Question

A 2.2 k ohm resistor in a stereo system dissipates 42 mw or power. What is the voltage across the resistor? What are the "hot" resistance level and current rating of a 120 V, 100 W bulb? What are the internal resistance and voltage rating of a 450 W automatic washer that draws 3.75 A? A calculator with an internal 3 V battery draws 0.4 mW when fully functional. a. What is the current demand from the supply? b. If the calculator is rated to operate 500 h on the same battery, what is the ampere-hour rating of the battery? A 20 k ohm resistor has a rating of 100 W. What are the maximum current and the maximum voltage that can be applied to the resistor? What is the total horsepower rating of a series of commercial ceiling fans that draw 30 A at 240 V? A 10 ohm resistor is connected across a 12 V battery. a. How many joules of energy will it dissipate in 1 min? b. If the resistor is left connected for 2 min instead of 1 min, will the energy used increase? Will the power dissipation level increase? How much energy in kilowatthours is required to keep a 230 W oil-burner motor running 12 h a week for 5 months? (Use 4 weeks = 1 month.) How long can a 1500 W heater be on before using more than 12 kWh of energy? A 60 W bulb is on for 10 h. a. What is the energy used in wattseconds? b. What is the energy dissipated in joules? c. What is the energy transferred in watthours? d. How many kilowatthours of energy were dissipated? e. At 12/kWh, what was the total cost?

Explanation / Answer

40]

a) Energy used in wattseceonds = 60 * 10 * 60 = 36000 Wattseconds.

b) Energy dissipated in joule is equivalent to that in wattsecond, so 36000 Jouls

c) Energy transferred in watt hours = 60 * 10 = 600 watt hours.

d) Kilowatt hours of energy dissipated = 600 / 1000 = 0.6 KWh

e) Total cost = 0.6 * 12 = 7.2 cents

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