Factors Affecting Induced Electromotiveforce Essay Research Paper

Factors Affecting Induced Electro-motive-force Essay, Research Paper

Planning Aim To find the factors that affect the amount of E.M.F. being produced. The amount of E.M.F. produced during the experiment when each type of factors is change. Background knowledge Electro-motive-force is the energy being supply to a charge. Battery is a type of energy. The energy that it provides is voltage. Battery voltage is sometime called electro-motive-force because it is used to “pump” around the electrons in the wire. The force can be generates by the moving of magnetic field as in the left-hand rules (field, current and force). It is the force that pushes the electrons around the circuit from the positive pole to the negative pole. That is why current directions in circuits are always marked from positive to negative. The voltage of the batteries varies in many volts e.g. 1.5V, 6V etc. A battery with a voltage of on volt is able to deliver one joule of energy for each coulomb of charge that passes through it. In other words, the voltage of a battery is the number of joules per coulomb that the battery can deliver when it is connected in a circuit. The law of left-hand rules or Fleming rules is that: * Thumb is for Motion. * First finger is for Field. * Second finger is for Current. Hypothesis * Does the change of frequency of the current affect the amount of electro-motive-force being produced. * Does the change of current affect the amount of electro-motive-force being produced. * Does the number of coil of green wire affect the amount of electro-motive-force being produced. * Does the number of coil of wire use for magnetizing the irons affect the amount of electro-motive-force being produced. Apparatus 1. AC power supply – provides electricity to the circuit. 2. Signal generator – for providing the electricity the circuit and also for changing the frequency of the current. 3. Ammeter – for measuring the amount of amp being produced. 4. Coil of wire – produce the magnetic field, which magnetize the pieces of iron. 5. Two pieces of iron – to be magnetized into a magnet. 6. Circuit wire – for connecting up the circuit. 7. Oscilloscope – for measuring the amount of electro-motive-force being produced. 8. Green wire – attached to oscilloscope carrying the electro-motive-force to it to be measure. Planning Safety precaution * Electricity is dangerous therefore be careful while connecting the circuit by having the power supply turned off at start. * Wire striper is sharp therefore while stripping careful not to cut your hand. * Too much current can made the wire to melt causing smoke and fire therefore tried to use the current as low as possible. * When magnetizing the iron careful not to put your finger between them because your finger will either be squash or cut. Method First I set up the apparatus as shown above. Then I plug a circuit wire to 0V and the other to the 2V then I turn on the ammeter follow by the power supply. I then look at the oscilloscope and measure the width and the height of the electro-motive-force wave. I record down the result and then I turn off the power supply. I change the circuit wires now to 0V and 4V. Then I do the same thing as I did before except that I change the voltage for every experiment from 0 and 4 to 0 and 6, 0 and 8 and 0 and 12. When I finish all that I have mentioned I then repeat all of them again in order to get the average results for each of the experiment. After I have finished repeating the experiments I then change from AC power supply to the signal generator. I plug the circuit wire to it and turn it on. Then after I it on I change the frequency of the current from 0Hz to 10Hz and I record down the width and the height of the electro-motive-force wave. When I finished I change the frequency from 10Hz to 20Hz and do the same thing as I did before except that I change the frequency for every experiment from 20Hz to 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz and 100Hz. Then when I finish I repeat all of them again so that I can get the average results for each of the experiment. When I have finished repeating the experiments I then change the signal generator back to AC power supply. I plug the circuit wires into the power supply at 0V and 6V but this time I will not vary the current but I will vary the number of coil of the green wire around the piece iron instead. First I have no coil around the piece iron and then I turn the power on and record down the width and the height of the electro-motive-force wave. Then I turn off the power and add one more coil on to the piece iron and turn the power on. Then do the same thing as before except that I change the number of coil of wire by increasing the number by one at the time until it reaches ten coils I stop. After that I repeat all of the experiment again in order to get the average results for each of the experiment. Planning Factors that will be included in the experiment * The frequencies of the current that will be vary when it is being tested. It will be vary every 10 Hz starting from 0 Hz to 100 Hz. * The current will be varying from the power supply. The current will be 0.25A, 0.5A, 0.9A, 0.11A and 0.31A. * Number of coil of the green wire will be change from 1 coil to 10 coils. Prediction What I have predicted the result will be is that for the change in voltage the amount of EMF produced will be proportional to the change of the voltage. For the change in the number of coils I predicted that the