Understanding Parallel Resistance Means Passing Electrical Exams

Understanding how to calculate total resistance when multiple resistances are in parallel is key to determining the total amperage in circuits supplying parallel branches. Can you answer the following question with ease?

Question:

Find the total amperage for a four branch parallel circuit, supplied by a 240 volt single-phase source if the resistances per branch is 10 ohms respectively.

Answer: 

96 amps

Total resistance = 10 ohms/4 branches

The greater the number of resistances in parallel the lower circuit resistance will be.

= 2.5 ohms

Total amperage = E/R

= 240 volts/2.5 ohms

= 96 amps

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