Transcript Electricity and Circuits Review

Electricity
White Board Activity
Identify this type of circuit
SERIES
Draw the correct symbol
for a battery, bulb &
switch
Draw the correct symbol
for a resistor
Define resistance and
give at least one example
of a resistor
Resistance determines the amount of
current flow.
A resistor is anything that slows down
the flow of electricity. EX. Light bulb,
refrigerator, coffee makers, lamps,
washer & dryer, PlayStation, computer.
Identify this type of circuit
Parallel
What rule does this type of circuit follow?
Loop Rule
Kirchhoff’s Rules
Loop Rule: The sum of the potential differences
(voltage) around any closed circuit loop is zero.
If each light bulb is identical, how much
voltage will be dropped off on each?
60 V
What rule does this type of circuit follow?
Junction Rule
Kirchhoff’s Rules
Junction Rule: the sum of all currents entering the
junction must equal the sum of all currents leaving
the junction.
If I1 = 3 A and I2 = 1 A, then I3 =
_______ A.
2A
What is the formula for Ohm’s law?
I= V/R
This formula can be manipulated 2 other
ways. Write the formulas when solving
for V and R.
V= I • R
R= V/I
What does “I” stand for and how is it measured?
I is the symbol for current
and is measured in amperes (A)
“CIA”
What does “V” stand for and how is it measured?
V is the symbol for electric potential difference
(aka- voltage)
and is measured in volts (V)
What does “R” stand for and how is it measured?
R is the symbol for resistance
and is measured in ohms (Ω)
“Rhome”
A
In which circuit below is the current
through the resistor the greatest?
C
When you need to
calculate the total
resistance in a series
circuit, what formula do
you use?
RT = R1 + R2 + R3
Calculate the total resistance
R1 = 59 ohms, R2 = 63 ohms, R3 = 28 ohms
150 ohms (Ω)
When you need to
calculate the total
resistance in a parallel
circuit, what formula do
you use?
1/RT = 1/R1 + 1/R2 + 1/R3
Calculate the total resistance
R1 = 6 ohms, R2 = 6 ohms
3 ohms (Ω)
Calculate the total resistance
R1 = 3 ohms, R2 = 6 ohms, R3 = 9 ohms
1.64 ohms (Ω)
D
B
C
C