Physics OCR B A Level: Investigating Electrical Circuits: Module 1: Practical Skills in Physics: Questions with Complete Solutions

How can you calculate the total resistance of a combination of resistors in series? The total resistance equals the sum of the individual resistances. R = R₁ + R₂...+ Rₙ How can you calculate the total resistance of a parallel combination of resistors? The total resistance equals the inverse of the sum of the inverses of the individual resistances. 1/R = 1/R₁ + 1/R₂...+ 1/Rₙ What device can be used to check the resistance of a component? An Ohmmeter or multimeter can be used to measure the resistance of a component. How can the percentage of the total voltage across a component be obtained? A voltmeter can be used to measure the potential difference across the component. This can then be divided by the total voltage in the circuit and multiplied by 100%. How should the total potential difference be shared across resistors in series? The potential difference should be shared in the same ratio as the resistances of the resistor