Ohm's Law and Electrical Power
A laptop runs on 120V and uses 2A of current. How much power does it use?
240W
This type of circuit has only one path for current to flow.
What is a series circuit?
The unit of measurement for electric current.
What is an ampere (A)?
This common household device automatically breaks a circuit if too much current flows through it, preventing electrical fires.
What is a circuit breaker?
This is the measure of how much electric charge flows through a circuit per second.
What is current?
A phone charger operates at 5V and has a resistance of 2.5 Ω. How much current does it use?
2A
This component limits the amount of current flowing in a circuit.
What is a resistor?
This is a material that allows electricity to flow easily.
What is a conductor?
Electric vehicles run on these instead of gasoline engines.
What are batteries?
This unit is used to measure voltage.
What is a volt (V)?
A light bulb has a resistance of 6 Ω and is connected to a 12V battery. How much current is flowing through the circuit?
2A
In this type of circuit, if one bulb goes out, the others stay lit.
What is a parallel circuit?
This type of material does not allow electric current to pass through easily.
What is an insulator?
This invisible electrical hazard can build up in dry conditions and cause shocks when touching metal.
What is static electricity?
If you increase the resistance in a circuit while keeping voltage the same, what happens to the current?
What is the current decreases?
A light bulb consumes 60 W of power and operates with a current of 0.5 A. What is the voltage applied to the light bulb?
120V
A closed circuit allows electricity to flow. What happens in an open circuit?
What is electricity stops flowing?
The law that states voltage equals current times resistance (V = IR).
What is Ohm’s Law?
Power plants generate AC (alternating current), but most small electronics require this type of current.
What is DC (direct current)?
This type of current flows in only one direction, commonly found in batteries.
What is direct current (DC)?
A hair dryer uses 1500 W of power when plugged into a 120 V outlet. What is the current flowing through the hair dryer?
12.5A
Name one advantage of a parallel circuit over a series circuit in household wiring.
What is if one device fails, the others still work?
This is the rate at which electrical energy is converted into another form, such as heat or light.
What is power?
Smart homes often use these types of lights, which consume less energy and last longer than incandescent bulbs.
What are LED lights?
Why is water dangerous around electrical devices, even if pure water does not conduct electricity well?
What is because impurities and minerals in water make it a good conductor, increasing the risk of electric shock?