Knowing how to apply Ohm’s Law can help you answer many questions on your electrical exam.
Preparing to answer Ohm’s Law related questions involving electrical circuits, such as finding the power dissipated by a resistor, the voltage-drop across a component, or the current flowing through a branch circuit is key to passing this exam. In this blog post, we will explain why understanding Ohm’s Law can help you pass your electrical exam.
Series and Parallel Circuits
Knowing how to apply Ohm’s Law rules for series and parallel circuits is vitally important. For example, you might be asked to find the equivalent resistance of a circuit that has both series and parallel connections. You can accomplish this by simplifying the circuit step by step, using Ohm’s Law rules for series and parallel resistances, until you have a single resistor that represents the whole circuit. Then you can use the appropriate Ohm’s Law formula to find any other quantity that you need, such as the voltage, current or power.
Ohm’s Law can also help you understand how adding or removing a resistor changes the current or voltage in a circuit, or how changing the resistance would affect the other variables. For example, if you increase the resistance in a series circuit, you decrease the current and increase the voltage drop across each resistor. If you decrease the resistance in a parallel circuit, you increase the current and decrease the voltage drop across each resistor.
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