REQUIRED PRACTICAL- IV characteristics

Question 1

WHAT IS THE AIM OF THE PRACTICAL?

Answer 1

To use circuit diagrams to construct appropriate circuits to investigate IV characteristics using equation R= I/V

Question 2

WHAT IS THE INDEPENDENT VARIABLE?

Answer 2

the voltage across the circuit

Question 3

WHAT IS THE DEPENDENT VARIABLE?

Answer 3

the current flowing through it

Question 4

WHAT IS THE CONTROL VARIABLE?

Answer 4

the temperature of the circuit

Question 5

EXPLAIN HOW TO CARRY OUR PRACTICAL FOR A FIXED RESISITOR?

Answer 5

1) Set up circuit with wires in the right way for a positive reading
2) using variable resistor set current to 0 and increase every time
to 0.01 and record the voltmeter recording
3) Continue doing this increasing by 0.01 till you get to 0.05 then flip wires for negative reading and repeat
4) DRAW GRAPH

Question 6

WHAT DOES THE GRAPH FOR A FIXED RESISTOR ON AN IV GRAPH REPRESENT?

Answer 6

OHMS LAW: That if resistance is constant current is directly proportional to potential difference

Question 7

WHAT ARE COMPONENTS THAT FOLLOW OHMS LAW CALLED?

Answer 7

Ohmic conductors

Question 8

WHAT HAPPENS TO THE GRADIENT OF THE LINE WHEN RESISTANCE IS INCREASED?

Answer 8

gradient gets less steep

Question 9

EXPLAIN HOW TO CARRY OUT PRACTICAL FOR A FILAMENT LAMP?

Answer 9

1) Set up circuit making sure wires are in correct way for a positive reading
2)Using variable resistor set current to 0 amps and increase by 0.01 , recording the potential difference
3) Do this to 0.05 then flip wires for negative result and repeat to -0.05
4) DRAW GRAPH

Question 10

WHAT DOES GRAPH FOR A FILAMENT LAMP ON AN IV CHARACTERISTIC GRAPH REPRESENT?

Answer 10

Filament lamps will eventually heat up as more current flows through
it and light intensity increases. As a result of this temperature increases which means so does resistance
CURVE GETS LESS STEEP AS RESISTANCE DUE TO TEMPERATURE INCREASES SO LESS CURRENT CAN FLOW THROUGH LAMP

Question 11

WHAT EXTRA PIECE OF EQIPMENT DO YOU NEED WHEN COMPLETING THIS EXPERIMENT WITH A DIODE?

Answer 11

milliampshunt- as ammeter recordings become very delicate and sensitive

Question 12

EXPLAIN HOW TO CARRY OUT PRACTICAL FOR DIODE?

Answer 12

1) Set up circuit making sure wires are right way for positive reading
2)set voltage to 0 using variable resistor increase by 0.05 this time
3) keep increasing to one volt and record P.D
4) remember to plat milliamps when DRAW GRAPH

Question 13

ON AN IV GRAPH FOR A DIODE WHY IS THERE ONLY A KINE IN A POSITIVE SECTION?

Answer 13

because diodes make current only travel one way