Resistance and Ohms law

Question 1

What is the method of the experiment investigating how voltage across a resistor affects current through it

Answer 1

1. Set up apparatus as shown in diagram
2. Turn dial on variable power supply until voltmeter reads zero
3. Measure current using ammeter
4. Repeat 2 and 3 increasing voltage
5. repeat experiment and take average
6. Draw a graph of V against i

Question 2

How does voltage across resistor affect current through it

Answer 2

As the voltage increases the current increases. Voltage and current are directly proportional

Question 3

What does Ohms law state

Answer 3

The current through a wire is directly proportional to the voltage across it if the temperature of the wire remains constant.

Question 4

What is Ohms law equation

Answer 4

V=IxR
V=voltage
I= Current
R= Resistance