Ohm’s Law
Ohm’s Law
In 1827, George Simon Ohm discovered that there was a definite relationship between voltage, current, and resistance in an electrical circuit. Ohm’s Law defines this relationship and can be stated in three ways.
1. Applied voltage equals circuit current times the circuit resistance. Equation (1-2) is a mathematical respresentation of this concept.
2. Current is equal to the applied voltage divided by the circuit resistance. Equation (1-3) is a mathematical representation of this concept.
3. Resistance of a circuit is equal to the applied voltage divided by the circuit current. Equation (1-4) is a mathematical representation of this concept.
where
I = current (A)
E = voltage (V)
R = resistance (Ω)
If any two of the component values are known, the third can be calculated.
Example 1: Given that I = 2 A, E = 12 V, find the circuit resistance.
Solution:
Since applied voltage and circuit current are known, use Ohm’s Law to solve for resistance.
Example 2: Given E = 260 V and R = 240 Ω , what current will flow through a circuit?
Solution:
Since applied voltage and resistance are known, use Ohm’s Law to solve for current.
Example 3: Find the applied voltage, when given circuit resistance of 100 Ω and circuit current of 0.5 amps.
Solution:
Since circuit resistance and circuit current are known, use Ohm’s Law to solve for applied voltage.
Example 3: Find the applied voltage, when given circuit resistance of 100 Ω and circuit current of 0.5 amps.
Solution:
Since circuit resistance and circuit current are known, use Ohm’s Law to solve for applied voltage.
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