Ohms Law
Ohms Law
Example 1
Example 2
The three electrical elements have a direct effect
on each other. The formula to calculate this effect
is Ohms Law.
The illustration at the right is Ohms law. The letters
represent the properties in the system.
V = Voltage,
C = Current,
R = Resistance.
(Hint: remember VCR.)
If you know any two of the values you can apply the
proper mathematical formula and find the third.
Lets apply Ohms Law to a circuit
Figure 5
Figure 6
Figure 7
Example 1: A starter motor for a WORKMAN 3200
Gas draws 90 amps when the system is operating
correctly.
Since we know the voltage and the current, we find
the resistance by taking the voltage and dividing it
by the current. (fig.6) 12.5 volts ÷ 90 amps =
0.135A.
Example 2: If we increase our system resistance to
A, what will happen to our current flow? 12.5
0.2
volts ÷ 0.2A = 62.5 amps. An increase in our sys-
tem resistance will decrease the current flow in our
circuit. This will result in what symptom? (Answer
=
slow crank or no start.)
What happens if we decrease our starting system
resistance to 0.04A? 12.5 volts ∏ 0.04A = 312.5
amps. This will result in what symptom? (Answer =
slow crank or no start.)
How can higher resistance cause the same symp-
toms as lower resistance? With higher resistance,
the amount of current flowing to the starter is lim-
ited by the additional resistance in the circuit. In the
case of lower resistance, the only way to lower re-
sistance in a circuit is to provide a shorter path to
ground or another path to ground. (That means that
a portion of the amperage flow is taking a different
path to ground than originally intended. So the re-
sult is actually a lower power output from the
starter).
4
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