Lesson: Ohm’s Law and Calculation of ResistancePhysics
In this lesson, we will learn how to use the formula V = IR (Ohm’s law) to calculate the resistance in simple electronic circuits.
Sample Question Videos
A resistor is placed in a circuit with an adjustable voltage source. Measurements of the voltage across and the current through the resistor are shown in the accompanying graph. Find the resistance of the resistor.
A resistor of resistance 1.8 kΩ is connected across a battery of emf 5.0 V. What is the current through the resistor?
Calculate the effective resistance of a pocket calculator that has a 1.35 V battery if the current through the calculator is 0.200 mA.