You can calculate power by multiplying by current.
What is voltage?
100
The total amount of energy used by an appliance is equal to the power of the appliance multiplied by the amount of _____________ the appliance is used.
What is time?
100
First, circuits have _________________ that are run by electrical energy.
What are devices?
100
If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit?
10 ohms
100
__________________ says that the resistance is equal to the voltage divided by the current.
What is Ohm’s law?
200
When calculating power we use the formula, P=VI, what does V stand for?
What is voltage, or volts?
200
Electric power is usually measured in thousands of ______________________. (without the time included)
What is watts, or kilowatts?
200
Second, a circuit has a _______________ of electrical energy.
What is source?
200
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
240 ohms
200
In a ___________ circuit there is only one path for the
current to take.
What is series?
300
When calculating power we use the formula, P=VI, what does P stand for?
What is power, or watts?
300
The unit of electrical energy is the ______________. (with the time included)
What is a kilowatt-hour?
300
Third, electric circuits are connected by _______________.
What is conducting wires
300
A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the resistance of the subwoofer?
20 ohms
300
In a ______________ circuit, there are several paths for current to take.
What is parallel?
400
When calculating power we use the formula, P=VI, what does I stand for?
What is current, or amperes?
400
Ten 100-watt bulbs lit for one hour use _______________ of energy.
What is 1,000 watt-hours, or 1 kilowatt-hour?
400
As you add bulbs to a series circuit, the resistance will do this.
What is increases?
400
A clock uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A?
150 ohms
400
The rate at which energy is transformed from one form to another is known as _____________________.
What is power?
500
A hair dryer has a power rating of 1,200 W and uses a standard voltage of 120 V. What is the current through the hair dryer?
What is 10 amps?
500
A 60 watt incandescent light bulb and a 6 watt led bulb are left on for one thousand hours. This is how much more energy will the incandescent bulb use. (answer in kWh)
What is 54 kilowatts-hours (kWh)
500
As new branches are added to a parallel circuit the overall resistance does this.
What is decreases?
500
A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current is passing through the circuit? C = V / R
What is 1.2
500
A __________________ is a device used to measure voltage.