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Practice Questions



This activity contains 25 questions.

Question 1.
The unit for measuring current is the


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Question 2.
The unit for measuring resistance is the


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Question 3.
In a simple circuit a voltage of 5 volts is applied across a resistance of 10 ohms. The current in the circuit is


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Question 4.
The power dissipated in the resistor in the previous question is


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Question 5.
What is the power drawn from the battery in question 3?


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Question 6.
A flashlight bulb draws 2.5 amps when connected to two C cells (3 volts). What is its resistance?


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Question 7.
What is the power disipated in the bulb in Question 6?


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Question 8.
A lantern bulb with a resistance of 4 ohms draws 1.5 A when connected to a certain battery. The battery voltage is


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Question 9.
A 1000 watt appliance is used 10 hours a day for 28 days per month. If the cost of electricity is $.10 a kwh (kilowatt-hour), how much does it cost to operate the appliance for a month?


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Question 10.
What is the cost of electricity in mils/J if it costs $.10 per kwh? (A mil is 1/1000 cent).


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Question 11.
One billion electrons pass a certain point in a micro second. This corresponds to a current of


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Question 12.
Three amps corresponds to how many electrons per seconds?


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Question 13.
What is the 'average' (rms) speed of the electrons in a wire at 30oC?


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Question 14.
A 2 amp current flows in a conductor which has 1 x 1024 free electrons per meter. What is their average drift velocity in the direction of the current?


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Question 15.
If the circuit in the above question is a 20 foot long wire in your automobile, how long would it take an electron to travel from the negative terminal to the positive terminal of the battery?


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Question 16.
Two otherwise identical wires are made of different materials, the second having twice the resistivity of the first. The first has a resistance of 2 ohms, the second has a resistance of


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Question 17.
Two aluminum wires have the same diameter but the second is twice as long as the first. If the first has a resistance of 2 ohms, the resistance of the second is


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Question 18.
Two copper wires have the same length but the second has twice the diameter of the first. If the resistance of the first is 2 ohms, the resistance of the second is


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Question 19.
What is the resistance of a 10 km long copper wire with a diameter of 4mm?


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Question 20.
If the wire in the above question has a resistance of 10 ohms and is transmitting 10 kW at 1000 volts, how much power is lost in the wire?


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Question 21.
If the power in the above question is being transmitted at 10000 volts, what is the power loss in the wire?


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Question 22.
If the peak AC voltage is 150 volts, what is the rms voltage?


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Question 23.
If the rms current is 30 amps, what is the peak current?


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Question 24.
One thousand peak AC watts is how many rms watts?


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Question 25.
What is the internal resistance of a 1500 watt electric space heater operating at a standard house voltage of 120 V?


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