Current, Voltage, Resistance
What is the symbol of voltage?
V
What is the R in the Ohm's law formula?
resistance
What does "energy in" in the efficiency formula mean?
The electrical energy the device uses
What type of energy is the desired type of energy that electrical energy is being transformed into by a flashlight
Light
A circuit that has multiple paths for electrons to follow is called a _ circuit
Parallel
What is the unit of current?
Amps/Amperes/A
What is the voltage if the current is 15 A and the resistance is 5000Ω?
75000V
What does "energy out" in the efficiency formula mean?
The usable energy the device produces
What type of energy is the desired type of energy that electrical energy is being transformed into by a speaker
Sound
What happens to resistance as you add more loads in a series circuit?
It increases
What is the unit of resistance?
Ohms/ Ω
What is the current if the voltage is 5V and the resistance is 2500Ω ?
0.002 A
What unit is used to measure electrical energy use in homes?
kWh (kilowatt hour)
What type of energy is the desired type of energy that electrical energy is being transformed into by a hair dryer?
Thermal
If four identical loads are connected in parallel and the voltage across the source is 5 V, what is the voltage across each load?
5 V
What is the definition of current?
The rate at which electrons flow past a certain point in a circuit.
If the voltage is 9 V and the current is 0.5 A, what is the resistance?
18 Ω
What is the percent efficiency of a device that uses 590 J of energy and produces 480 J of usable energy?
81%
What type of energy is the desired type of energy that electrical energy is being transformed into by an electric mixer
Mechanical
If four identical loads are connected in parallel and the current through the source is 2A, what is the current through each load?
0.5 A
What is the definition of voltage?
The difference in electric potential energy per unit charge between two points
When the voltage across a load increases, what happens to current? As resistance increases, what happens to current?
Increases, decreases
What is the percent efficiency of a device that uses 850 J of energy and produces 670 J of usable energy?
79%
What type of energy is the desired type of energy that electrical energy is being transformed into by a clothes dryer (two)
Mechanical and thermal
If two identical loads are connected in series and the voltage across the source is 8V, what is the voltage across each load?
4 V