REQUIRED PRACTICAL- Resistance of a wire

Question 1

WHAT IS THE AIM OF THE PRACTICAL?

Answer 1

To investigate relationship between length of wire and reistance

Question 2

WHAT IS THE INDEPENDENT VARIABLE?

Answer 2

Length of the wire

Question 3

WHAT IS THE DEPENDENT VARIABLE?

Answer 3

Resistance of wire

Question 4

WHAT IS THE CONTROL VARIABLE?

Answer 4

wire gauge and type and temperature of wire

Question 5

WHAT EQUIPMENT DO YOU NEED?

Answer 5

-Board with specific wire
-Voltmeter
-Ammeter
-Crocodile clips
-Batter
-meter ruler

Question 6

EXPLAIN HOW TO CARRY OUT PRACTICAL FOR RESISTANCE OF A WIRE

Answer 6

1) Set circuit up with voltmeter in parallel to wire and ammeter in series
2) Record length of wire starting at 1m and place crocodile clips at this point
3) take reading of ammeter and voltmeter and record this
4) Keep repeating this and decreasing wire length to 10cm
5) PLOT GRAPH

Question 7

WHAT HAPPENS AS WIRE LENGTH DECREASES

Answer 7

resistance also decreases

Question 8

WHY IS THERE MORE RESISTANCE WHEN THE WIRE IS LONGER

Answer 8

because more wire for electrons to flow through and more oppositions to resist them along the way