To

**calculate**the**total**overall**resistance**of a number of resistors connected in this way you add up the individual**resistances**. This is done using the following**formula**: Rtotal = R1 + R2 +R3 and so on.**Example: To calculate**the**total resistance**for these three resistors in series.How do you calculate ohms?

Enter any two known values and press "Calculate" to solve for the others. For example, a 100 watt light bulb operating on 120 volts AC will have 144

**ohms**of resistance and will draw 0.833 Amps. Enter 100 in the Watts field and 120 in the Voltage field and press Calculate to**find**the resistance and current.