I-V components Required Practical

Question 1

What is the aim of this practical?

Answer 1

Investigate relationship between current and potential difference using a resistor, bulb and diode.

Question 2

What equipment is used?

Answer 2

• Ammeter
• Voltmeter
• Fixed resistor
• Variable resistor
• Filament lamp
• Diode
• Power supply
• Wires

Question 3

What are the variables?

Answer 3

• Independent: Potential difference
• Dependent: Current
• Control: Potential difference of power supply + use of the same equipment

Answer 4

1. Connect circuit in series but connect the voltmeter in parallel to fixed resistor.
2. Ensure that the power supply is set to zero at the start.
3. Record the reading on the voltmeter and ammeter.
4. Use the variable resistor to alter the potential difference.
5. Record the new readings on the voltmeter and ammeter.
6. Repeat steps three to four, each time increasing the potential difference slightly.
7. Reverse the power supply connections and repeat steps two to six.
8. Plot a graph of current against potential difference for each component.
9. Repeat the experiment but replace the fixed resistor with a bulb.