Electric Charge
Positively charged subatomic particles
protons
material which does not allow electrons to flow freely
insulator
measure of how difficult it is for electrons to flow through a material
resistance
Electrical Energy is measured in what unit? What is the unit's symbol?
kilowatt-hour or kWh.
What are the three parts of a circuit?
voltage difference, connecting wires, & resistance
Negatively charged subatomic particles
electrons
provides a pathway to drain excess charge into the Earth
grounding
What is Current = Voltage/Resistance
Ohm's Law
Current x Voltage =
Resistance
Calculate the current into a desktop computer plugged into a 120-V outlet if the power used is 180 W.
1.5 amps
If protons equal electrons what do you get?
neutral charge
closed conducting loop through which electricity flows
circuit
flow of electrons with one path
series circuit
the rapid movement of excess charge from one place to another
electric discharge
Should a circuit breaker be connected in series or parallel to the circuit that it is protecting?
series
How do like charges interact?
repel
measure of how much electric energy an electron in a circuit can gain from a battery
voltage
For safety in homes and buildings these limit the amount of current in the wiring.
fuses or circuit breakers
materials that allow electrons to move easily
conductor
A circuit break is tripped when the current in the circuit is greater than 15 amps. If the voltage difference is 120 volts, what is the power being used when the circuit breaker is tripped?
1800 watts
Electric charges exert a force from each other at a distance...(Vocabulary Word)
electric field
What causes lightning?
a buildup between opposite charges becomes so great that the insulating capacity of air breaks down and there is a rapid discharge of electricity.
the length and thickness of a wire will affect this
electric flow
All objects exert this
electric force
How can you quickly determine whether a string of light is wired in series or parallel?
Unscrew a bulb and if the entire stringer of goes out, then it's wired in series, but if all the other light remain let then it's wired in parallel.