Flashcards in Unit 2-Electricity Deck (35):

1

## What is an insulator?

### A substance that does not allow electrons to flow through it. Static electricity can build up on an insulator. Examples: hair, plastic and rubber

2

## What is an conductor?

### A substance that allows the free flow of electrons through it. Static electricity does not build up in a conductor. Example: metals

3

## What is an electric charge?

### A negative or positive charge the exerts an electric force.

4

## How to make an electric charge?

###
Remove electrons: substance becomes positive

Add electrons: substance becomes negative

5

## What is friction?

### The force resisting the relative motion of two surfaces in contact. Friction can remove electrons from one object and cause them to transfer to the other.

6

## What are the laws of electric charges?

###
1. Opposite charges attract

2. Like charges repel

3. Charged objects attract neutral objects.

7

## What is the electrostatic series law?

### When changing by friction occurs, the substance higher on the list always loses electrons and becomes positively charged. The substance lower on the list gains electrons and becomes negatively charged.

8

##
Which substance will become positive and which will become negative?

Fur and ebonite

Look at chart*

###
Fur positive

Ebonite negative

9

##
Which substance will become positive and which will become negative?

Rubber and sulfur

Look at chart*

###
Rubber positive

Sulfur negative

10

##
Which substance will become positive and which will become negative?

Wool and cotton

Look at chart*

###
Wool positive

Cotton negative

11

## 2 important facts about a parallel circuit.

###
1. In a parallel circuit, the electrons have more than one path to follow.

2. In a parallel circuit, the appliances do not share the electrical pressure.

12

##
True or false?

A dry cell gives static electricity?

### True

13

##
True or false?

Static electricity lights our homes?

### False

14

##
Static electricity causes lighting?

True or false?

### True

15

##
How many path does a series circuit have to follow?

### 1

16

## What is static electricity?

###
Charge/electrons are stationary

Generated by friction

17

## What is current electricity?

###
Electrons are moving/ flow in a circuit

Generated through the conversion of energy forms.

18

## What do electrons travel through allowing us to do work?

### Circuits

19

## What is the formula to find resistance?

### R=V/I

20

## What is the formula to find ohms.

### I= V/R

21

## What is the formula to find volts?

### V=IxR

22

## What is the problem solving method we use?

###
G(given)

R(required)

A(analyze)

S(solve)

p(paraphrase)

23

## A current of 4 A flows through a 40 ohm resistor in a circuit. What is the voltage?

###
G- I=4A, R=40 ohms

R- find the voltage

A- V=IxR

S-v= 4x40

=160v

P- the voltage of the resistor is 160v

24

## Is= I1=I2=I3= is what type of circuit?

### Series

25

## Vs= v1+v2+v3+ is what type of circuit?

### Series

26

## Reqivalent= R1 + R2+R3 + is what type of circuit?

### Series

27

## Is=I1 + I2+ I3 + is what type of circuit?

### Parallel

28

## Vs= v1 =v2=v3= what circuit is this?

### Parallel

29

##
1 = 1 + 1 + 1

Requivalent R1 R2 R3

Is what type of circuit?

### Parallel

30

## How do you find efficiently?

###
UEO x100

TEI

UEO- useful energy

output

TEI- total energy input

31

## A light bulb uses 100 J of electrical energy and produces 35J of light energy. Calculate the percent efficiency of the light bulb.

###
G- TEI= 100 J, UEO=35J

R- find % efficiently

A- % eff=UEOx100

TEI

S- 35/100x100 =35%

P- the efficiency of the light bulb is 35%.

32

## What is on peak cost

### .18/kWh

33

## What is off peak time?

### $0.0087

34

## Name the quantity, the symbol of quantity, the unit and symbol.

###
1. Potential difference= V= Volt (V)

2. Energy= E= Joules (J)

3. Resistance= R= Ohms (J)

4. Current= I= Amps (A)

5. Power= P= Watts (W)

6. Charge= Q= coulombs (C)

35