Resistance, Potential Diff, REQ.PRAC

Question 1

Higher the resistance

Answer 1

The more difficult it is for charge to flow
-The lower the current

Measured in ohms

Question 2

What does potential difference (or voltage) tell us

Answer 2

Difference in electrical potential from one point in a circuit to another

Question 3

The bigger the potential difference across a component

Answer 3

• The greater the flow of charge through the component
• The bigger the current

MEASURED IN VOLTS

V=IR

Question 4

REQ.PRAC of factors that affect resistance of circuit

Answer 4

1) set up standard test circuit
2) pre test circuit and adjust supple voltage to make sure there is a difference in readings when taken
3) record voltage and current at range of lengths using crocodile clips
4) use variable resistor to keep current through the wire the same at each length
5) use V and I to calculate R

Question 5

Hazards and risks of REQ.PRAC

Answer 5

• current flowing through wire can cause it to get hot

- adjust variable resistor to keep it low