# Circuit Report

Essay by cheekynicki March 2006

Objective

The aim of the experiment is to understand the properties of the passive elements and the resonance.

Apparatus

1. Unknown Box

2. Passive Elements: Resistors, Inductors and Capacitors

3. A.C. Power supply

4. Connecting Wires

5. Multimeter

Introductory Theory

Passive elements

Passive elements are elements that can either absorb energy or store energy.

There are 3 types of passive elements, which are shown below:

Resistor: A resistor is a two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in accordance with Ohm's law.

Inductor: An inductor is a passive electrical device employed in electrical circuits for its property of inductance. It stores energy in magnetic form.

Capacitor: A capacitor is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed.

Black

It is a box which contains an unknown passive element other than a resistor.

Both of them are connected in series.

Resonance

A circuit is said to be in resonance when its impedance is equal to its resistance. There are two types of resonant circuit: Series and Parallel.

2 types of resonant circuits are shown as the following:

Series Resonant Circuit: Passive elements are connected in series.

Parallel Resonant Circuit: Passive elements are connected in parallel.

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Experiment 1: Unknown Component

Aim

The blackcontains an unknown passive element other than a resistor and it is connected to a resistor in series. The objective is to find the unknown component in the black box.

Procedure:

1) The unknown box is connected in series with a resistor, R in the circuit.

2) An AC power supply is connected to the circuit.

3) The potential different is set to be 1V throughout the experiment.

4) A multimeter...