ONLY ELECTRONS flow as a result of a (potential) difference
in electric charge. Protons and Neutrons DO NOT flow.
Direct Current (DC) - the movement of charge in one direction
Alternating Current (AC) - a reversing (back and forth) movement
of charge
Voltage - the POTENTIAL for electrons to flow. Units: Volts,
symbol=V.
Current - the movement or flow of electrons. Units: Amps,
symbol=A.
Resistance - slowing or reducing the flow of electrons/charge.
Units: Ohms, symbol=?
Ex. How will the amount of current change if the voltage remains the same and the resistance is increased? Ans. The current will decrease.
Understand how and why fuses and circuit breakers
work.
Fuse - a piece of conductor that breaks/melts if too much current
goes through it; it is not reusable.
Circuit breakers - a switch that flips if too much current goes
through it; it is reusable.
Understand the difference between dry cell and
wet cell batteries.
Dry cell - the electrolyte is a paste; Ex. Flashlight and clock
battery
Wet cell - the electrolyte is a liquid; Ex. car battery
Identify: fuse, circuit breaker, dry and wet cell, resister, closed circuits and open circuits.
Ex. Draw a series circuit (include a battery and 3 resisters).
Ex. Draw a parallel circuit (include a battery and 3 resisters).
Your house is wired like a parallel circuit.
Electricity Study Quiz
1. Give 2 examples of conductors. ___________________________________
2. Give 2 examples of insulators. ____________________________________
3. When the electroscope's foil leaves are charged and there is no contact with the charged plastic rod, this is an example of charge by _________.
4. When the electroscope's foil leaves are charged and there is contact with the charged plastic rod, this is an example of charge by _________.
5. Charge that moves in one direction is called ___________ current.
6. Charge that moves in a back and forth direction is called
_________ current.
7. Give an example of a dry cell battery. ____________________
8. Give an example of a wet cell battery. ____________________
Ohm's Law: V = I X R
V = Voltage I = Current R = Resistance
9. You are powering a 22? heater with a 110V power source.
What amount of current is moving through the circuit? ___________________
10. How will the amount of current change if the voltage remains the same and the resistance is increased? ____________________________
11. What is the function of circuit breakers and fuses? __________________ ___________________________________________________________
12. What advantage do circuit breakers have over fuses?
________________
___________________________________________________________
13. Is your house wired in series or parallel? ______________
14. Draw how a lightening rod works:
15. and 16. Draw and label a series and parallel circuit.
Include 1 battery and 2 resisters/loads.