Circuits

Question 1

Whats V = IR?

Answer 1

Potential difference = Current X Resistance

Question 2

What is current? What is it measured in?

Answer 2

Flow of electrons around a circuit, measured in amperes

Question 3

What is potential difference? What is measured in?

Answer 3

Force driving flow of electrons by a cell/battery, measured in voltage

Question 4

What is resistance? What is measured in?

Answer 4

Anything resisting flow of electrons in a circuit, measured in ohms

Question 5

What is charge? What is it measured in?

Answer 5

Measure of current flowing in a certain time, measured in coulombs (Q)

Question 6

What is J=QV

Answer 6

Energy = Current x voltage

Question 7

What is Q = IS?

Answer 7

Charge = Current X time (seconds)

Question 8

Give 4 things of series circuit

Answer 8

• 1 loop
• If anything goes wrong, circuit goes wrong
• Current equal everywhere in circuit
• Voltage shared among components (Vtotsl = V1 + V2 +V3…)

Question 9

Give 4 things of parallel circuit

Answer 9

• More than 1 loop
• If anything breaks, everything still works
• Current shared between all loops
• Voltage across components are equal

Question 10

Equipment for resistance of wire (

Answer 10

Ammeter, voltmeter,

Question 11

Give 2 problems in the resistance of wire practical and how to solve them/why

Answer 11

Zero error - Measuring that should be zero (due to crocodile clip and wire on metre ruler
Heating effects - If temperature of wire increases, so does resistance - reduce by only turning on current when taking reading, turn off inbetween - reduce by using low p.d, lowering resistance