![]() So we can use this formula to get the answer it’s going to be (1/R1 + 1/R2 + 1/R3) -1. What’s the equivalent resistance of this circuit? Let’s say this is a four ohm resistor a six ohm resistor and an 8 ohm resistor. Now what if we have three resistors in parallel. Now 1 + 1 is 2, so this becomes 2 of a 10 and when you raise a fraction to the negative 1 power, you basically flip the fraction and so this becomes half of 10 or 10 divided by 2 which is 5. To calculate the total resistance for two resistors in a parallel circuit it’s (1/ R1 + 1/R2) -1. So what’s the equivalent resistance of this circuit? Now whenever you have two resistors in parallel and if they have the same value the equivalent resistance will simply be half of that value, so the equivalent resistance is going to be 5 ohms. Let’s say this is a 10 ohm resistor and this is a 10 ohm resistor. Now, what if we have two resistors in parallel. ![]() You can simply replace the two resistors with a single resistor. So we can describe this as a 30 ohms resistor. What is the equivalent resistance or the total resistance of the circuit? In a series circuit the total resistance is simply the sum of all the resistors. Let’s say this is a 10 ohm resistor and this is a 20 ohm resistor. So let’s say if you have two resistors R1 = 10 and R2 = 20 connected in series. Equivalent Resistance of simple and complex circuit:
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