Resistance RP (P1)

Question 1

Length of a wire

Answer 1

Connect a circuit with a voltmeter and an ammeter with crocodile clips 100cm apart on a wire
Record the potential difference and current and divide the potential difference by current to find resistance
Repeat moving the clips 10cm closer each time

Question 2

Series vs parallel

Answer 2

Set up a series circuit with two resistors, an ammeter and a voltmeter
Do the same but a parallel circuit
Record the readings
Resistance= potential difference/current

Question 3

Factors which affect resistance

Answer 3

Length of wire- electrons hit more ions
Thinner wires- less electrons to carry charge
Arrangement of resistors- sum of inverse when in parallel

Question 4

Series

Answer 4

The resistors are both on the middle path, voltmeter at bottom, ammeter and battery at top

Question 5

Parallel

Answer 5

Two resistors on the middle two paths, voltmeter at bottom, ammeter and battery at top

Question 6

Results

Answer 6

Resistance increases with length in a directly proportional relationship

Question 7

Filament lamp graph explain

Answer 7

Higher or lower current, hotter it is

Hotter, electrons vibrate more, higher resistance

Question 8

Diode graph explain

Answer 8

Semi-conductors, very few free electrons, need a high p.d to conduct

Question 9

AC vs DC

Answer 9

AC periodically changes direction