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Q&A for How to Solve Parallel Circuits

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Three resistors A, B and C are connected in parallel and take a total of 7.9 ampere. Resistor A takes 2.5 ampere and has a resistance of 48 ohms. The current through B is twice as much as that of C. How can I calculate the currents of resistors B and C?

Community Answer

Subtract 2.5 from 7.9, and divide the result by 3. The result is the current of C. Multiply this by 2 to find the current of B.

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Question

How can I find the total power in the current voltage?

Community Answer

Find the total power in any circuit: pt=p1+p2+p3+,,,+pn. In terms of voltage and current, by using this formula: p=vi (or) p=i*i*r (or)p=v*v*r.

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Question

What happens in a parallel circuit?

Community Answer

In a parallel circuit, current gets divided among the parallel branches in a manner so that the product of current and the resistance of each branch becomes the same. The sum of the current in each branch is equal to the total current of the circuit.

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Question

Can you illustrate how to find voltage and current when you are only given resistance in 3 branches of a parallel circuit?

Community Answer

It is not possible to find the voltage and current when you are only given resistances. If there were a battery (a total system voltage) in the circuit, then you could solve for the missing quantity in V = I R.

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Question

How do I use an ohmmeter?

Community Answer

You might find this Wikihow article helpful: how to use an ohmmeter.

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Question

What if it has a 5 to 6 resistance? How can I solve it?

Community Answer

Resistance for parallel circuits are calculated by the formula: 1/Req= 1/R1 + 1/R2.

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