Module 1 - ALevel Experimentations (Module 4 PAGs)

Question 1

What is the setup for collecting data for IV characteristics of components

Answer 1

• Component parallel to voltmeter, in seres with ammeter and variable resistor

Question 2

List the equipment used in the determination of resistivity

Answer 2

• Voltmeter
• Ammeter
• Power supply
• Micrometer
• Metre rule

Question 3

Describe the method of collecting data to dtermine resistivity

Answer 3

• Measure diameter, using a micrometer, at three different points in three different orientations and take a mean
• Using crocodile clips and a ruler, connect a set length of wire toa circuit with ammeter in series and voltmeter in parallel
• Record current and pd
• Calculate resistance using: R = V/I
• Repeat using a different length of connected wire

Question 4

Describe the graphical solution for determining resistivity

Answer 4

R = pL/A
- Draw a graph of Resistance against Length
- Gradient is p/A
- Multiply gradient by A

Question 5

List the equipment needed in the determination of Internal resistance

Answer 5

Power supply
Ammeter
Volmeter
Variable resistor

Question 6

Describe the method to collect data for the determination of internal resistance

Answer 6

• Set varible resistor to max value
• Record voltage and current pair
• Decrease the resistance and repeat obtaining pair of I and V value

Question 7

What is the graphical solution to determine internal resistance

Answer 7

V = E - Ir
- Plot a VI graph and multiply gradient by -1 to get internal resistance (r)

Question 8

At what value of variable resistance does a cell output maximum power

Answer 8

When the variable resistor has a resistance equal to the internal resistance of the source of emf

Question 9

What is the unit for timebase

Answer 9

Time per division

Question 10

What does the y axis represent

Answer 10

Volts per division

Question 11

For DC what do you see on an oscilloscope when the time base is turned off

Answer 11

A single dot on the y axis

Question 12

For AC what do you see on an oscilloscope when the time base is turned on

Answer 12

A continuous wave forme

Question 13

For DC what does an oscilloscope show when the time base is turned on

Answer 13

A straight horizontal line

Question 14

For AC what does an oscilloscope show when the time base is tunred off

Answer 14

A vertical line on the y axis

Question 15

How to measure time period (T) from oscilloscope

Answer 15

1. Measure the number of divisions from one peak to another
2. Multiply by timebase (time per div)

Question 16

How to measure Amplitude (A) from oscilloscope

Answer 16

Measure the number of divisions from the top to the bottom of the wave
Divide by 2
Multiply by the volts per div