When it comes to working out the unknown resistance in a series parallel circuit, many people feel intimidated by the complexity of the process. But the truth is that it’s fairly straightforward once you’re familiar with the basics - and you can even work out the answer without using a calculator. So how do you go about finding the missing resistance? Let’s take a look.

To start, you first need to map out your circuit. Draw a diagram with all of the components labelled, including the voltage source and each resistor. Then, use Ohm’s law to calculate the current flowing through each individual branch. This will be helpful because it gives you information about the current coming into each resistor.

Next, you’ll need to apply the rules of series and parallel circuits to work out the total resistance of the circuit. For example, if two resistors are connected in series, then the total resistance is equal to the sum of their resistances. If they’re connected in parallel, then the total resistance is equal to the product divided by the sum of the resistances.

Once you’ve calculated the total resistance of the circuit, you can move on to the final step: finding the unknown resistance. Start by subtracting the known resistances from the total resistance to get the remaining resistance. Then, use Ohm’s law to figure out the voltage across the unknown resistor. Finally, divide this voltage by the current flowing through the unknown resistor to calculate its resistance.

The process of finding the unknown resistance in a series parallel circuit may seem intimidating at first, but it really isn’t that difficult. All it takes is a bit of practice and patience to get the hang of it. With a little bit of time and effort, you’ll soon find yourself confidently calculating the missing resistance in no time.

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