Topic 10 electricity

Question 1

Define static electricity

Answer 1

• Material rubbed togther = force created = attracts/repels objects without contact

Question 2

William Gilbert

Answer 2

• British physician
• Magnetism
• Electricity

Question 3

Properties of electric charge

Answer 3

1) Charge quantization = limit to smallest charge on a free particle = 1.602x10-19 = net charge of any system = integer multiple
2) Magnitude independent of charge type
3) Conservation of charge

Question 4

How many e- in 1 Coulomb?

Answer 4

6.24x1018

Question 5

Define triboelectric effect

Answer 5

• Contact electrification = results in materials becoming charged after coming in contact with material then separating

Question 6

Describe Coulombs law

Answer 6

• 2 objects have charges = exert on each other
• Magnitude = linearly proportion to net charge of object + inversely proportional to square ofdistance between them

Question 7

Properties of electrical force

Answer 7

• Attractive/repulsive forces
• Without physical contact
• Not all objects effected = conductors/insulators
• Magnitude of force inversely proportional to separation

Question 8

Define electric field

Answer 8

• Exists at any point in space = test charge experiences electrical force
• Vector field = shows direction that positively charged particle will move
• Point away from positive = towards negative

Question 9

What is capacitor?

Answer 9

• Device = stores electrical charge + energy
• 2 conductors separated by insulator