investigating I-V characteristics

Question 1

step 1

Answer 1

Measure current through the component using an ammeter connected in series.

Question 2

step 2

Answer 2

Measure potential difference across component using a voltmeter connected in parallel.

Question 3

step 3

Answer 3

Vary the resistance using a variable resistor.

Question 4

Add resistor P for the diode. why?

Answer 4

to prevent damage and use a milliammeter for small readings.

Question 5

step 4

Answer 5

Record a range of values for current and potential difference.

Question 6

how can you ensure the current is low?

Answer 6

use a variable resistor

Question 7

what can you do to avoid temperature increase?

Answer 7

ensure switch is open between readings

Question 8

step 6

Answer 8

Reverse the connections on the battery and repeat steps 3 and 4 to find the I-V relationship for negative potential difference and current.

Question 9

step 7

Answer 9

Plot an I-V graph (current against potential difference) for the component.

Question 10

what is the independent variable?

Answer 10

Potential difference

Question 11

dependent variable

Answer 11

current

Question 12

control variable

Answer 12

component and rest of circuit