Electrical Physics

Question 1

Electric current

Answer 1

How many electrons pass a point per second.

Question 2

Electric Potential Difference

Answer 2

The change in potential energy in two defined points in the circuit

Question 3

Power

Answer 3

The rate at which work is done or the rate at which energy is transferred or transformed.

Question 4

Conservation of Energy

Answer 4

Energy cannot be created nor destroyed, it can only be gained or lost.

Question 5

Ohmic Resistors

Answer 5

Resistance does not change (constant) and Graph of I vs V is a straight line.

Question 6

Non-ohmic resistors

Answer 6

Does not follow Ohm’s law and resistance changes with temperature (as temperature increases, metal resistance also increases)

Question 7

Series Circuit

Answer 7

• Only 1 way for current to flow, which stays constant throughout circuit
• No current will flow if a component is broken (no closed loop)
• The amount of charge flowing in and out of a component in the circuits is know as the law of conservation of electric charge.

Question 8

Parallel Circuit

Answer 8

• Each loop of a parallel circuit acts like an independent circuit with its own current.
• Voltage is the same across each branch of a parallel circuit (same amount of energy per charge)
• Current splits at junctions therefore the current is not the same in every part of the circuit.
  
  • The amount of charge flowing in and out of a component in the circuits is know as the law of conservation of electric charge.

Question 9

Junction

Answer 9

Where the current divides, and rejoins

Question 10

Advantage of parallel circuits compared to series.

Answer 10

Globes connected in parallel are brighter than in series because the potential energy of the charges is not shared between the globes