Net resistance is the overall resistance value of a circuit, which is a measure of how much the circuit resists the flow of electric current. It is calculated by combining the individual resistance values of all components in the circuit.
To calculate the net resistance, you need to add up all the individual resistance values of the components in the circuit. If the circuit is a series circuit, simply add up all the resistance values. If the circuit is a parallel circuit, use the formula 1/R = 1/R1 + 1/R2 + 1/R3 + ... where R is the net resistance and R1, R2, R3, etc. are the individual resistance values.
When resistors are connected in series, the net resistance increases. This is because the current has to flow through each resistor, and each resistor adds to the total resistance of the circuit. The net resistance in a series circuit is equal to the sum of all the individual resistance values.
When resistors are connected in parallel, the net resistance decreases. This is because the current has multiple paths to flow through, and the total resistance of the circuit decreases. The formula for calculating the net resistance in a parallel circuit is given in question 2.
The unit of measurement for net resistance is ohms (Ω). This is the same unit used for individual resistance values of components in a circuit. It represents the amount of resistance that a circuit offers to the flow of electric current.