# Physics Required Practical: I-V Characteristics

Includes;

- The Method (In Blue)

- Common Mistakes (In Yellow)

- Safety Notes (In Pink)

• Created by: Hannah
• Created on: 19-03-19 17:42
• Physics Required Practical: I-V Characteristic
• Method 1: Resistor
• 1. Set up a parallel circuit, with a resistor, ammeter, voltmeter, variable resistor, battery and switch.
• 2. For different settings of the variable resistor, record the values of current and potential difference. Take 5 pairs of readings. Turn off the power pack in between readings to ensure the temperature of the resistor is kept constant.
• 3. Swap the leads at the power supply.
• 4. Take readings as before, and record them.
• Method 2: Filament Lamp
• 1. Set up a parallel circuit, with a filament lamp, ammeter, voltmeter, variable resistor, battery and switch.
• 2. For different settings of the variable resistor, record the values of current and potential difference. Take 5 pairs of readings.
• 3. Swap the leads at the power supply.
• 4. Take readings as before, and record them.
• Method 3: Diodes
• 1. Set up a series circuit, with a variable resistor, ammeter, voltmeter, battery and diode.
• 2. This activity can be tricky. Take any readings you can get, even if they are really close together. After you have a few readings, try altering the setting on the variable resistor. Take four further pairs of readings, if possible.
• 3. Swap the leads at the power supply.
• 4. Take at least five pairs of readings, as before, and record them.
• Don't turn the power pack up too high! It will damage the components.
• The filament bulb and other components might get hot. Take care not to burn yourself.
• If the equipment is damaged, don't use it.
• Do not use A.C in these experiments, use D.C instead.
• It's hard to set the potential difference to round numbers, using the variable resistor. You can take out the variable resistor and use the power pack values for potential difference, if you're struggling. The intervals will remain the same.
• In the diode activity, if you're getting a very low current that doesn't increase at all, try swapping the leads round.
• Don't forget the protective resistor if you have a low current diode! Without the protective resistor, the diode will blow!