Force fields and electromagnets

Question 1

When an acetate rod is rubbed with a duster the rod becomes positively charged. Where do the particles move from and to?

Answer 1

Electrons move from the rod to the duster

Question 2

What charge does an object have if it loses electrons

Answer 2

Positive

Question 3

What occurs when like charges move closer to each other

Answer 3

repulsion

Question 4

Is plastic a good insulator

Answer 4

Yes

Question 5

True or false, like charges repel

Answer 5

True

Question 6

Friction causes the transfer of

Answer 6

Electrons

Question 7

What do you use to measure current

Answer 7

Ammeter

Question 8

what is the symbol for lamp

Answer 8

A circle with a cross inside

Question 9

If resistance in a circuit is increased what happens to the current

Answer 9

It decreases

Question 10

What are the units of electrical resistance

Answer 10

Ohms

Question 11

What describes electrical resistance

Answer 11

A measure of opposition to the flow of electric current

Question 12

What is current measured in

Answer 12

Amps (A)

Question 13

Which type of circuit has components arranged in one loop

Answer 13

A series circuit

Question 14

In parallel circuits the ______ is divided between branches

Answer 14

current

Question 15

In a series circuit with a 9V battery and three bulbs what would the potential difference across each bulb be

Answer 15

3V

Question 16

What happens to voltage in a series circuit

Answer 16

The voltage is split between the components

Question 17

What happens to current in a series circuit?

Answer 17

It is the same in every part of the circuit

Question 18

How would you best describe a parallel circuit

Answer 18

A circuit with mire than one route for the current to take

Question 19

What happens to voltage in a parallel circuit

Answer 19

Voltage is the same across each path

Question 20

How can you increase the strength of an electromagnet

Answer 20

Increase the amount of coils, increase current, increase the amount of iron

Question 21

What advantage does an electromagnet have over a magnet

Answer 21

It can be switched on and off

Question 22

National grid

Answer 22

The network of cables and transformers used to transfer electricity from power stations to consumers