Experiment Description

Experiment

Experiment E08    Light Bulb and Electrical Power

Objectives
  • Study the variation in resistance with current of a light bulb
  • Study the variation in power with current of a light bulb
  • Comprehend electrical connections and convert into their equivalent circuits
  • Using a network of light bulbs, compare the power consumed by various arrangements of the light bulbs
Description
In this activity, you will use voltmeter and ammeter to measure the power output of a device. You will also construct a number of networks to investigate the total power output.

In Experiment 1, you will apply different voltages across the light bulb to study how the resistance and power consumption changes.

In Experiment 2, you will study the power consumption when several light bulbs are joined in different ways.
Apparatus
circuit board [1]
rheostat (0 - 20 ohm) [1]
battery box with 3 cells [1]
identical light bulbs (3.8 V) [4]
ammeter (100mA and 1 A) [1]
voltmeter (5 V) [1]
light bulb (12 V) [1]
12 V low voltage power supply [1]
Experiment