OHM’S LAW

[Pages:2]OHM'S LAW

The rate of the flow of the current is equal to electromotive force divided by resistance.

I = Intensity of Current = Amperes E = Electromotive Force = Volts R = Resistance = Ohms P = Power = Watts The three basic Ohm's law formulas are:

I = ?RE??

R = ??EI ?

E = I x R

Below is a chart containing the formulas related to Ohm's law. To use the chart, from the center circle, select the value you need to find, I (Amps), R (Ohms), E (Volts) or P (Watts). Then select the formula containing the values you know from the corresponding chart quadrant.

E2 R R x I2

R x I

E x I

WATTPS EVOLTS

P I

PxR

P R

AMPSI

ROHMS

E I

P EE

E2 PP

R

I2

Example: An electric appliance is rated at 1200 Watts, and is connected to 120 Volts. How much current will it draw?

Amperes = ?WV?oa?ltt?tss?

I = ?PE?

I = 1?12?20?00? = 10 A

What is the Resistance of the same appliance?

Ohms =A?mV??op?let?sr?e?s

R = ?EI?

R = ?1?12?00? = 12

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AMPS = ?W?O?AH?TM?T?SS?

I = ?R?P? = ?1?21?02?0? = 100 = 10A

AMPS = ?WV?O?A?LT?TT?SS?

I = ?P?E? = ?11?22?00?0? = 10A

AMPS = ?OV?OH??LMT?SS?? WATTS = ?VO?OH?LM?T?SS?2

I = ??RE? = ?11?22?0? = 10A P = ?ER?2? = ?11?22?0?2 = ?1?41?,42?0?0? = 1200W

WATTS = VOLTS x AMPS P = E x I = 120 x 10 = 1200W WATTS = AMPS2 x OHMS P = I2 x R = 100 x 12 = 1200W

VOLTS = WATTS x OHMS E = P x R = 1200 x 12 = 14,400 = 120V

VOLTS = AMPS x OHMS E = I x R = 10 x 12 = 120V

VOLTS = ?WA?MA?TP?T?SS? OHMS = ?WV?O?AL?TT?TS?S2?

E = ?PI? = ?11?20?0?0 = 120V R = ?PE?2 = ?1?,12?20?00?2 = ?11?4,?2,4?00?0?0 = 12

OHMS = ?W?A?MA?TP?TS?S2?

R = ?PI?2 = ?11?20?00?0? = 12

OHMS = ?VA?OM?L?PT?SS??

R = ?EI? = ?1?12?00?? = 12

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