Electricity Quiz Review

Definitions

1

A positively charged subatomic particle.

Proton

2

Define "static electricity".

"An accumulation/buildup of excess electric charge on an object"

3

Materials which electrons easily flow through

Conductors

4

Surrounds every electric charge and exerts a force on other charges.

Electric field

5

Net movement of electric charges in a single direction.

Electric Current

Diagrams

1

Draw the electric field lines on 1 positive charge

proton with arrows radially outwards

2

Draw the electric field lines for a single negative charge 

electron with arrows radially pointing inwards

3

Draw electric field lines for two positive charges that are very close to each other

Two protons with lines close, but not touching/ bending away. Arrows point outwards

4

Draw the electric field lines for 1 electron and 1 proton very close to each other

Electron and proton very close, lines touching- outer lines like "spider legs"

5

Drawing a positively charged rod and 2 metal spheres, show the first stage of "charging by induction"

Two metal spheres touching and a rod brought close but NOT touching. Electrons move into sphere closest to the rod and protons move into sphere farther away from rod.

Problem Solving

1

What is the voltage of a circuit with a current of 2A and a resistance of 10 Ohms?

20 V

2

What is the current in a circuit with a voltage of 12 V and a resistance of 70 Ohms?

0.17 A

3

What is the resistance in a circuit with a voltage of 18V and a current of 3A?

6 Ohms

4

A 2C charge is brought near a 4C charge. The distance between them is 0.5m. What is the electric force between them?

F= 2.88 x10¹¹ N

5

An 8 nC charge is brought near a 2.5 uC charge. The distance between them is 2 cm. What is the electrostatic force between them?

0.45 N

Facts

1

What is the charge of a single electron?

-1.6 x10^-19 C

2

Explain how an object can be "net neutral".

Object has same about of protons and electrons. (net charge of 0)

3

Explain what a "ground" is and how it functions. (Related to charging by induction and grounding)

A very large conductor- gives electrons a way of escaping and releasing buildup of charge

4

Explain the difference between a "closed" circuit and an "open" circuit.

Closed circuit- every piece of the circuit is connected and electricity can flow.

Open circuit- something in the circuit has been disconnected and electricity cannot flow(ie. battery not connected)

5

Explain how electric current flows like a bouncing ball down the stairs.

Ball thrown down the stairs and moves in all different directions- but always has "net movement" downwards