Lesson: Energy Dissipation by Conductors
In this lesson, we will learn how to calculate the dissipation of energy by an electric circuit from its current, its resistance, and the voltage across it.
Sample Question Videos
Worksheet: 25 Questions • 5 Videos
In the circuit shown, the voltage source supplies 120 V, the resistance is 0.800 Ω, and the bulb is rated at 75.0 W.
What power will the bulb dissipate if 15.0 A passes through the wire when the motor is turned on?
What is the power of the motor?
The voltage across a resistor of resistance 0.010 kΩ is measured to be 4.00 V. What is the power dissipated by the resistor?
A car battery of emf 16 V is used to power a lamp that has a power rating of 13.00 W and a voltage rating of 16.00 V when the lamp is taken on a camping trip. The battery is connected to the lamp by a cable of length 1.50 m containing 14-gauge copper wire of cross-sectional area 2.1 mm2. The charge carrier density of the copper in the wire .
How much current does the lamp draw from the battery?
What is the average time taken for an electron to pass through the connecting cable?