Parallel circuits are electronics circuits that have several different paths for current to follow, like a highway or river that branches off into many smaller routes or streams and then comes back together into a single source. In a parallel circuit, current will continue to flow, even if one part of the circuit is blocked. Your household electrical wiring is a good example of how parallel circuits work--if a lightbulb burns out in a lamp, it doesn't plunge half the house into darkness. When calculating the parameters of parallel electrical circuits, three measurements need to be known: voltage, amperage, and resistance.
Things You'll Need
You can calculate the voltage of any part of the parallel circuit by knowing the voltage of the source of the circuit's power. In other words, the voltage is the same on any of the paths of a parallel circuit. Here's an example: If you have a 12-volt battery connected in parallel to four light bulbs, each will draw 12 volts of power from the battery. The 12-volt battery is the source of the circuit's power, and each of the light bulbs is a parallel circuit path.
Calculate the amperage of the parallel circuit by adding the amperage of all the components on the parallel paths. For example, if the four light bulbs in the example in Step 1 each draw 2 amps, the total amperage of the parallel circuit will be 8 amps.
Calculate the total resistance of the parallel circuit by using the formula 1/Rt = 1/R1 + 1/R2 + 1/R3, and so on depending on number of components, where Rt is the total resistance, R1 is the resistance of the first path, R2 the second, and so on.
- Electronics For Dummies; McComb and Boysen; 2005
- Understanding parallel circuits
- Photo Credit NLGraphics
How to Calculate Voltage in a Parallel Circuit
You don't need to consider all of a parallel circuit's branches to determine its voltage. Unlike a series circuit, a parallel circuit...
How to Calculate Power in a Parallel Circuit
When resistors are wired in a circuit with a constant voltage, you can calculate the power of the circuit if you know...
How to Calculate Amperage in a Series Circuit
How to Calculate Circuit Amperage. Amperage is defined as the amount of electrical energy running through an appliance ... How to Calculate...
How to Calculate Parallel Circuit Wire Size
The size of a wire is directly related to the amount of electricity it delivers. The more amps of electricity it uses,...
How to Control Amperage in a Circuit
How to Control Amperage in a Circuit. ... How to Find Volts in a Parallel Circuit; Comments. Related Ads. Check It Out...
How to Calculate Watts in a Parallel Circuit
How to Calculate Watts in a Parallel Circuit. ... Use this formula-Power = amps squared divided by resistance-to calculate the watts of...
How to Calculate Series Circuits
How to Calculate Impedance in Parallel Circuits; How to Calculate the Voltage in a Series & a Parallel Circuit; Comments You May...