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# Ag Power Web Enhanced Course Materials

### Electrical

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## Ohm's Law - Calculating Voltage

### What is Voltage (E)?

Voltage is the potential difference in a circuit and it is caused by the unbalanced state of atoms. You need a complete circuit made of conductive material in order to have current flow and the current will flow from the negative source to the positive source. Ohms law states that if you have one volt applied to a one ohm resistance the current will be one amp. (E = I x R) Voltage (E) on the equation is missing and you have the (I) and (R) left. Because they are divided by the vertical line that means to multiply the two values. This is a simple circuit with a current of 12 amps (12A) and a resistive load of 1 Ohm (1 ). Use the formula explained on the left side of the page to calculate the voltage. Since we know the battery is suppling 12 Amps (I), and there is a resistive load of 1 Ohm (R) placed in series, the current will be: E = 12(I) times 1(R) or E = 12

Click the term to see examples of Current and Resistance.