Lab Report

Ohm’s Law

Introduction

The purpose of the experiment is to find the relationship between current, voltage and resistance, and verify Ohm’s Law V=IR. We will use different resistors, and light bulbs, and also connect in series and parallel.

Procedures

1. Plug a resistor into AC current with ammetre and voltmetre

2. Measure the current and voltage, and calculate the resistance

3. Replace with another resistor and a bulb respectively, and repeat step 2

4. Connect 2 resistors in series and parallel respectively, and repeat step 2

Results and Analysis

Resistor #1 Resistor #2 R1,R2 Series R1,R2, Parallel Lightbulb

I/A | V/V | I/A | V/V | I/A | V/V | I/A | V/V | I/A | V/V |

0.01 | 0.5 | 0.02 | 0.5 | 0.01 | 1.0 | 0.03 | 0.5 | 0.03 | 0.5 |

0.02 | 1.0 | 0.05 | 1.0 | 0.02 | 1.5 | 0.07 | 1.0 | 0.05 | 1.0 |

0.03 | 1.5 | 0.08 | 1.5 | 0.03 | 2.0 | 0.11 | 1.5 | 0.06 | 1.5 |

0.04 | 2.0 | 0.10 | 2.0 | 0.04 | 2.5 | 0.15 | 2.0 | 0.07 | 2.0 |

0.05 | 2.5 | 0.13 | 2.5 | 0.05 | 3.0 | 0.19 | 2.5 | 0.08 | 2.5 |

0.06 | 3.0 | 0.16 | 3.0 | 0.06 | 3.5 | 0.22 | 3.0 | 0.09 | 3.0 |

0.07 | 3.5 | 0.19 | 3.5 | 0.07 | 4.0 | 0.26 | 3.5 | 0.10 | 3.5 |

ΔV= ± 0.1 V base on the caliper of voltmetre

ΔI= ± 0.01 A base on the caliper of ammetre

Conclusion

The resistance is directly proportional to the voltage, and inversely proportional to the current, R=V/I