Electrical Charges
When do two charged objects attract?
when the objects have opposite charges
What type of circuit is used when one light on a string burns out and the rest stay lit?
parallel circuit
This type of material lets electrons easily flow through it.
a conductor
Who invented the lightning rod?
Benjamin Franklin
This is the force between electrical charges.
an electrostatic field
When do two charged objects repel?
when the objects have the same charge
What type of circuit is used when one light on a string of lights burns out and the rest also go out?
series circuit
This type of material does not allow electrons to flow through it.
an insulator
What does a lightning rod do?
It redirects lightning strikes to prevent damage to a building.
Electrostatic charges are produced by the addition or removal of __?
electrons
What stores charges in an electric circuit?
a capacitor
Find the current in a circuit with the resistance of 5 ohms and a voltage of 10 volts.
current = voltage/resistance = 10 volts/ 5 ohms =
2 A
Is metal a conductor, insulator, or semiconductor?
conductor
What does a ground-fault circuit interruptor do?
It protects against electrical shock at locations where a person could become part of the electrical path to the ground.
What is a photovoltaic cell?
It is a direct current that uses light to produce an electric potential.
What happens in an electrical discharge?
An object loses its charge.
How does a circuit breaker help prevent electrical shock and fire?
It prevents fire due to too much current in the circuit by flipping a switch and opening the circuit.
This type of material can act as a conductor or an insulator.
semiconductor
What type of energy is at work when pieces of paper are attracted to a plastic comb?
electrical energy
What unit is used for electric potential difference?
volt
Describe the movement of electrons through a conductor.
Electrons move from the point of higher electrical potential energy to the point of lower electrical potential energy.
How does a fuse help prevent shock and fire?
It prevents fires due to too much current in the circuit by a thin wire breaking and interrupting the circuit.
Is rubber a conductor, insulator, or semiconductor?
an insulator
What can electrostatic precipitators be used for that is beneficial?
reduce pollution
What type of printer uses electrostatic electricity to print?
laser printer