# 4 Ohms Law

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```					Ohms Law
Ohm’s Law

“Current (I) is proportional to Voltage (V)
and inversely proportional to Resistance (R)”

V                                     V
I             V  IR                R
R                                     I
Ohm’s Law and Power
Formulas

P
V
I          V
I         R

Reproduced by permission of Tony van Roon, 2002 http://www.uoguelph.ca/~antoon
Using Ohm’s Law

Use this triangle
V
Cover the value you want

e.g. if you want current
I       X   R

So I = V / R
V

I   X   R
Example 1

9 volts across a 3Ω resistor:
We want current so cover I
I=V/R                       V
= 9V / 3 Ω
I   X   R
I = 3 amps
Questions
Use Ohm’s Law to calculate the following:

1.   R = 3Ω, V = 6V       1.   I = V/R = ____
2.   I = 4A, V =12V       2.   R = V/I = ____
3.   R = 6Ω, I = 3A       3.   V = IxR = ____
4.   V = 5V, R = 5Ω       4.   I = V/R = ____
5.   I = 2A, R = 3Ω       5.   V = IxR = ____

```
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 views: 2 posted: 9/29/2012 language: English pages: 6
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