Terms
Ability to do work
What is energy
This device is used to slow the current of electricity
What is a resistor
Voltage units and device used to measure
What is volts and voltmeter (or multimeter)
Lightning is an example
What is static discharge.
A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
What is an electromagnet
Unit of electric charge
Coulomb
A circuit has a resistance of 4 ohms and a current of 3 amps. What is the voltage? Show all 3 steps with units.
What is 12 V
Describe the primary energy transformation in a gas powered car and one form of waste energy.
What is chemical to mechanical, sound or heat
Anything that converts electrical energy in a circuit to another form of energy
What is a load
Symbol and unit for current
What is amperes and I
A light bulb uses 200J of electrical energy and produces 40J of light energy. The rest of the energy is lost as heat. Calculate the energy efficiency of the light bulb. Show all 3 steps with units.
What is 20%
Device that increases the voltage in a circuit.
What is a step-up transformer
Another name for a variable resistor i.e. light dimmer
What is a rheostat
Draw a circuit with a 4 cell battery, 2 lightbulbs, a motor, and a switch that turns off the motor only.
What is...
Joules/Second simplified
What is Watt
If a device draws 2 amps of current with 10 volts across it, what is the resistance? Show all 3 steps with Units.
What is 5 ohms
Must remain constant in order for a scenario to Obey Ohm's law
What is resistance
electrical energy that doesn't flow
What is static electricity
Units in which electrical power usage is primarily measured — they are what you see on your electricity bill.
What is kilowatt hour
A computer runs at a constant power of 250 watts for 90 minutes. Calculate the total energy used in kilowatt-hours (kWh). Show all 3 steps with units.
What is 0.375 kilowatt-hours (kWh)
created when an electric current flows through a wire coil.
What is a magnetic field