University of South Alabama. Multiply by seconds to get an energy result in Joules. Both these answers are twice too big. For example, if you know the resistance and voltage of a circuit, rearrange V = IR to I = V / R, and plug in the known values to solve for I, the current. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Remember: Anytime you work with wiring, be sure to turn off the circuit at the main breaker panel. Ralph received his B.S. Physics 2 (PH 202L) Uploaded by. The chances of such electrical problems in old homes were quite high because the circuits fitted during older days. Solution to Example 4 How do I setup the equation to find the resistance? Solution to Example 2 This is not a lot of current. The electrical charge leaves the positive terminal of the power supply, passes through each resistor or other components in turn, then returns to the negative terminal. An electric shock happens when you switch on or off a device. I2 = 1.6 / 4 = 0.4 A, Example 4 The voltage across resistor R1 is equal to 4 V. Find the current passing through resistor R2 and the voltage across the same resistor. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/1e\/Solve-a-Series-Circuit-Step-1-Version-2.jpg\/v4-460px-Solve-a-Series-Circuit-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/1\/1e\/Solve-a-Series-Circuit-Step-1-Version-2.jpg\/aid484350-v4-728px-Solve-a-Series-Circuit-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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