How many joules of energy does a 8 W nightlight dissipate in 8 h? How many kilow

Question

How many joules of energy does a 8 W nightlight dissipate in 8 h? How many kilowalthours does it dissipate ? How long must a steady current of 1.4 A exist in a resistor that has 3 V across it to dissipate 12 J of energy? What is the power delivered by a 12 V battery if the current drain is 40 A? The current through a 4 k ohm resistor is 7.2 mA. What is the power delivered to the resistor ? The power consumed by a 2.2 k ohm resistor is 240 mW. What is the current level through the resistor? What is the maximum permissible current in a 82 ohm, 2 W resistor? What is the maximum voltage that can be applied across the resistor? The voltage drop across a transistor network is 22 V. If the total resistance is 16.8 k ohm, what is the current level? What is the power delivered ? How much energy is dissipated in 1 h? If the power applied to a system is 10 kW, what is the voltage across the line if the current is 48 A? A 1 W resistor has a resistance of 4.7 M ohm. What is the maximum current level for the resistor? If the wattage rating is increased to 2 W, will the current rating double? A 2.2 k ohm resistor in a stereo system dissipate 42 mW of 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 420 W automatic washer that draws 3.75 A? A calculator with an internal 3 V battery draws 0.4 m W 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 ?

Explanation / Answer

25.

given that

I= 7.2 mA

R = 4 k ohm

we know that

power deliever to the resistor is

P = I2 * R

P = (7.2*10-3)2 * 4*10^3

P = 207.36*10^(-3) = 207.36 mW

P = 0.207 Watt

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