Electric Power Online Assessment
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What is your FIRST name? *
What is your LAST name? *
Who is your physics teacher? *
What period do you have physics? *
The next two questions refer to a resistor with a resistance of 200. ohms operating on a 120. V household circuit (the voltage drop across the resistor is 120 V).
What power is dissipated (used) by this resistor when the circuit is on? *
1 point
How much money would it cost to run this resistor for 10 hours a day for 30 days if the electric company charges $0.11 per kilowatt-hour? A kilowatt-hour is the amount of energy used by a 1000 W device in one hour. *
1 point
The diagrams below show two resistors connected in either series or parallel with a battery of voltage delta V. All resistors are identical and both batteries are identical. How does the power dissipated by these two arrangements compare? *
1 point
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Household circuits are usually connected in parallel, with a switch called a circuit breaker in series with the parallel outlets. A circuit breaker is designed to pop open if the current running through it exceeds its rating, thereby interrupting the circuit, so that current is never allowed to get high enough to cause a fire. An example of such a circuit is shown below, with a 120V household voltage and a 15 amp circuit breaker. Would all three appliances shown below be able to run at the same time? *
1 point
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