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T: 01246 455565
F: 01246 455244
W: www.reconelectrical.co.uk
E: [email protected]
Calculating With Ohm's Law
A. When Volts and OHMS are known:
Volts
E
Amperes =
or, I =
OHMS
R
Example: Find the current of a 120 volt circuit with a resistance of 60 OHMS.
E
120
I=
=
= 2 Amperes
R
60
B. When Watts and Volts are known:
Watts
Amperes =
P
or, I =
Volts
E
Example: 120 Volt Circuit has a 1440 Watt Load. Determine the current.
P
I=
1440
=
E
= 12 Amperes
120
C. When OHMS and Watts are known:
Example: Circuit consumes 625 watts through a 12.75 OHM resistor. Determine the current.
* One Electrical Horsepower = 746 watts. Electric Motors are rated in horsepower.
** One kilowatt = 1000 watts. Generators are rated in kilowatts.
Units 1-6 Ambrose Buildings, Broombank Road, Chesterfield, Derbyshire, S41 9QJ
VAT Reg: 598 6371 75
Company Reg: 3191383
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