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Electricity Unit Exam
9.3 Energy and Cost
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Cards (16)
Power
is relationship between
voltage
and
current
Formula for finding
Power
:
P
=
VI
P =
Power
:
Watt
,
W
Energy is the relationship between
power
and
time
Formula for
Energy
:
E=
PT
E=
Energy
:
Kilowatt-hour
,
kWh
T=
Time
:
Hour
,
H
(If
time
is in
minutes
turn it into
hours
)
1
kW
=
1000
W
Cost
is relationship between
energy
and
rate
Formula for finding
cost
:
C
=
RE
R =
Rate
:
¢
or
$
/kWh
C =
Cost
:
¢
or
$
Percent
Efficiency
is important to know because it can help
save
money
on
electricity
bill
Power Triangle
A)
P
B)
I
C)
V
3
Energy Triangle
A)
E
B)
P
C)
T
3
Cost
A)
C
B)
E
C)
Rate
3