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Science > Unit 2-Electricity > Flashcards

Unit 2-Electricity Flashcards

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1
Q

What is an insulator?

A

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

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2
Q

What is an conductor?

A

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

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3
Q

What is an electric charge?

A

A negative or positive charge the exerts an electric force.

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4
Q

How to make an electric charge?

A

Remove electrons: substance becomes positive

Add electrons: substance becomes negative

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5
Q

What is friction?

A

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.

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6
Q

What are the laws of electric charges?

A
  1. Opposite charges attract
  2. Like charges repel
  3. Charged objects attract neutral objects.
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7
Q

What is the electrostatic series law?

A

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.

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8
Q

Which substance will become positive and which will become negative?
Fur and ebonite
Look at chart*

A

Fur positive

Ebonite negative

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9
Q

Which substance will become positive and which will become negative?
Rubber and sulfur
Look at chart*

A

Rubber positive

Sulfur negative

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10
Q

Which substance will become positive and which will become negative?
Wool and cotton
Look at chart*

A

Wool positive

Cotton negative

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11
Q

2 important facts about a parallel circuit.

A
  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.
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12
Q

True or false?

A dry cell gives static electricity?

A

True

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13
Q

True or false?

Static electricity lights our homes?

A

False

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14
Q

Static electricity causes lighting?

True or false?

A

True

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15
Q

How many path does a series circuit have to follow?

A

1

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16
Q

What is static electricity?

A

Charge/electrons are stationary

Generated by friction

17
Q

What is current electricity?

A

Electrons are moving/ flow in a circuit

Generated through the conversion of energy forms.

18
Q

What do electrons travel through allowing us to do work?

A

Circuits

19
Q

What is the formula to find resistance?

A

R=V/I

20
Q

What is the formula to find ohms.

A

I= V/R

21
Q

What is the formula to find volts?

A

V=IxR

22
Q

What is the problem solving method we use?

A 
G(given)
R(required)
A(analyze)
S(solve)
p(paraphrase)
23
Q

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

A 
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
Q

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

A

Series

25
Q

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

A

Series

26
Q

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

A

Series

27
Q

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

A

Parallel

28
Q

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

A

Parallel

29
Q

1 = 1 + 1 + 1
Requivalent R1 R2 R3
Is what type of circuit?

A

Parallel

30
Q

How do you find efficiently?

A 
UEO x100
TEI
UEO- useful energy 
output 
TEI- total energy input
31
Q

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

A 
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
Q

What is on peak cost

A

.18/kWh

33
Q

What is off peak time?

A

$0.0087

34
Q

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

A
  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
Q

How to do the long questions?

A
  1. Covert W into Kw by dividing by 1000
  2. Multiply KW with hour per a dayx how many days you use it.
  3. Times your answer with the onpeak price and off peak price
  4. Subtract

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