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Final Electricity Review
Electric Force
Law of Static Charges
Name:_____________________
Push or pull created by electricity
=Action at a distance force (no contact
needed)
Opposite charges attract (+,-)
Like charges repel (+,+ or -,-)
Neutral charges attract + and A charged object comes near another
object that pushes the like charges away
Charging by induction
One object picks up electrons from the
other object
Charging by conduction
Current Electricity
vs.
Static Electricity
Units
Parts of A circuit
Resistance
Current electricity : when electricity
(electrons) move along a pathway
conductor.
Static electricity : When electrons build up
in one spot (on an insulator)
Current (I)= amperes (A)
Voltage (V)= volts (V)
Resistance(R) = Ohms (Ω)
1) A source of voltage (potential
energy)
2) A pathway for the electrons to
travel on (usually copper wire)
3) An electric load
the ability of a substance to slow down
the flow of electrons
-electric load = high resistance
-wire = low resistance
Ohm’s Law
resistance(R) = Voltage(V)
Current(C)
or V = IR
circuit with only one pathway for electrons
Series circuit
Current and Voltage in Series
The voltage across all the electric loads add up to
the voltage of the battery.
Current and Voltage in Parallel
Current is the same across the circuit
The voltage across electric loads in parallel are all
equal to the voltage of the battery
The current on the two pathways equals the
current from the cell.
When an electric circuit has more than one
possible pathway for electrons travel.
Parallel circuits
Battery
How do batteries produce voltage
Electrochemical cell. Creates electrical
energy from chemical energy
1) 2 terminals (-,+)
2) The electrodes two different types of metals
3) The electrolytic solution breaks atoms off
electrode leaving some of the electrons behind
(becomes negative)
4) At the same time electrons are pulled off the
other electrode making it positively charged.