snc 1di electricity review. fill in the blank charging by __________ causes electrons in a neutral...

SNC 1DIElectricity Review

Fill in the Blank

Charging by __________ causes electrons in a neutral object to move.

Charging by friction causes electrons in a neutral object to move.

A(n) __________ is a material that prevents the flow of current.

A(n) insulator is a material that prevents the flow of current.

In a series circuit, a light bulb is referred to as the ________.

In a series circuit, a light bulb is referred to as the load.

The opposite of static electricity is ____________.

The opposite of static electricity is current electricity.

The name of the instrument used to measure static electricity is a(n) ___________________.

The name of the instrument used to measure static electricity is a(n) electroscope.

Lightning is created by ______________________.

Lightning is created by induced charge separation.

Charged objects attract neutral objects, opposite charges attract, and same charges repel are the three postulates of the ____________________.

Charged objects attract neutral objects, opposite charges attract, and same charges repel are the three postulates of the law of electrical charges.

To measure the amount of electrons moving past a point in a circuit you would need to use a(n) ____________.

To measure the amount of electrons moving past a point in a circuit you would need to use a(n) ammeter.

Potential difference is measured using a(n) _____________ in units of ________________.

Potential difference is measured using a(n) voltmeter in units of Volts.

Connecting wire, a load, an energy source and a(n) _____________ are the four components of a circuit.

Connecting wire, a load, an energy source and a(n) switch are the four components of a circuit.

True or False

Tap water is a good insulator of electricity because it contains dissolved salts and charged particles.

Tap water is a good insulator of electricity because it contains dissolved salts and charged particles.

False

In charging by induction, electrons are transferred between the objects.

In charging by induction, electrons are transferred between the objects.

False

Static electricity refers to the movement of electrons in a closed path.

Static electricity refers to the movement of electrons in a closed path.

False

When the thickness of a wire increases, the resistance of the wire decreases.

When the thickness of a wire increases, the resistance of the wire decreases.

True

An ammeter must be connected in parallel with a circuit to take accurate readings.

An ammeter must be connected in parallel with a circuit to take accurate readings.

False

The wires in the heating element of a hair dryer have relatively high resistance.

The wires in the heating element of a hair dryer have relatively high resistance.

True

Similarities/Differences

- describe similarities/differences between each pair

static electricity, current electricity

static electricity, current electricity

-Both involve electrons

-Static electricity is an imbalance of charge at rest

-Current electricity is the movement of electrons in a circuit

insulator, conductor

insulator, conductor

- Both are used to affect the flow of electrons

- Insulators restrict the flow of electrons- Conductors allow the flow of electrons

series circuit, parallel circuit

series circuit, parallel circuit

-both are pathways that involve the flow of electrons-series circuit has only one path for electrons-parallel circuit has 2 or more paths for the flow of electrons

ammeter, voltmeter

ammeter, voltmeter

- Both are used to measure electron in a circuit

- Ammeter measures current in Amperes- Voltmeter measures potential difference in Volts

charging by contact, induction

charging by contact, induction

-both are methods to charge objects-in contact the object is touched by a charged object-in induction the object is not touched by a charged object

lightning, grounding

lightning, grounding

-both are attempts to neutralize-in lightning, electrons strike the ground in order to neutralize the ground-when any object is grounded, extra electrons are either pulled from the ground or pushed to the ground to neutralize the object

Multiple choice

Which of the following materials would make the best insulator?a) pure waterb) wooden pegc) iron naild) copper wire

Which of the following materials would make the best insulator?a) pure waterb) wooden pegc) iron naild) copper wire

Which of the following is an example of charging by induction?a) static cling on clothesb) attracting paper with a charged rodc) rubbing a balloon on a sweaterd) charging an electroscope by touching it

Which of the following is an example of charging by induction?a) static cling on clothesb) attracting paper with a charged rodc) rubbing a balloon on a sweaterd) charging an electroscope by touching it

Neutral objects can become charged by

a) gaining or losing neutrons

b) gaining or losing protons

c) gaining or losing electrons

d) gaining or losing protons, neutrons, or electrons

Neutral objects can become charged by

a) gaining or losing neutrons

b) gaining or losing protons

c) gaining or losing electrons

d) gaining or losing protons, neutrons, or electrons

Which factor best explains why lightning strikes the ground?

a) metals conduct the current electricity to the ground

b) friction between the cloud and the ground

c) electrostatic discharge between cloud and Earth

d) charging by friction and direct contact

Which factor best explains why lightning strikes the ground?

a) metals conduct the current electricity to the ground

b) friction between the cloud and the ground

c) electrostatic discharge between cloud and Earth

d) charging by friction and direct contact

Which of the following refers to the path along which electrons can flow?a) circuitb) currentc) potential differenced) resistance

Which of the following refers to the path along which electrons can flow?a) circuitb) currentc) potential differenced) resistance

Which device is used to measure the potential difference across a load?a) ammeterb) ohmmeterc) voltmeterd) circuit breaker

Which device is used to measure the potential difference across a load?a) ammeterb) ohmmeterc) voltmeterd) circuit breaker

Which of the following units is used to measure current?a) amperesb) voltsc) wattsd) joules

Which of the following units is used to measure current?a) amperesb) voltsc) wattsd) joules

Diagrams

With use of a diagram, draw and explain how you can create an induced charge in a neutral electroscope by using a piece of fur and ebonite rod.

BEFORE DURING AFTER

With use of a diagram, draw and explain how you can create an induced charge in a neutral electroscope by using a piece of fur and ebonite rod.

With use of a diagram, draw and explain how you can create a permanent charge in a neutral electroscope by using a piece of fur and ebonite rod.

BEFORE DURING AFTER

With use of a diagram, draw and explain how you can create a permanent charge in a neutral electroscope by using a piece of fur and ebonite rod.

With use of a diagram, draw and explain how an induced separation charge forms and how a lightning bolt occurs.

With use of a diagram, draw and explain how an induced separation charge forms and how a lightning bolt occurs.

With use of a diagram, draw a series circuit that has 4, 1.5 V cells, 3 light bulbs, 1 ammeter between light 2 and 3, 1 voltmeter across light three and one switch.

With use of a diagram, draw a series circuit that has 4, 1.5 V cells, 3 light bulbs, 1 ammeter between light 2 and 3, 1 voltmeter across light three and one switch.

With use of a diagram, draw a circuit that has 1, 1.5 V cell, 3 light bulbs and 1 motor in parallel, each with a switch that controls each item and a voltmeter that measures the potential difference of the motor.

With use of a diagram, draw a circuit that has 1, 1.5 V cell, 3 light bulbs and 1 motor in parallel, each with a switch that controls each item and a voltmeter that measures the potential difference of the motor.

CalculationsShow FULL solutions!

A current of 0.50 A flows through a light bulb, when a potential difference of 120 V is placed across the light bulb. What is the resistance of the light bulb?

A current of 0.50 A flows through a light bulb, when a potential difference of 120 V is placed across the light bulb. What is the resistance of the light bulb?

GivenI = 0.5 A R = VV = 120 V IWant = 120VR = ? 0.5 A

= 240 Ω

A colour television has a resistance of 80 Ω. How much current passes through the television when it is plugged in to a 120 V wall socket?

A colour television has a resistance of 80 Ω. How much current passes through the television when it is plugged in to a 120 V wall socket?

GivenR = 80 Ω I = VV = 120 V RWant = 120 V I = ? 80Ω

= 1.5 A

A toaster connected to a 110 V power source has 6.0 A of current flowing through it. How much power is dissipated as heat?

A toaster connected to a 110 V power source has 6.0 A of current flowing through it. How much power is dissipated as heat?

GivenV = 110 V P = V x II = 6.0 A = 110 V x 6.0 AWant = 660 WP = ?

How much energy does the motor of a 615 W refrigerator use in one day, if it runs for 14 hours a day?

How much energy does the motor of a 615 W refrigerator use in one day, if it runs for 14 hours a day?

Givent = 14 hours x 60 min/hour x 60 s/min = 50 400 sP = 615 WWantE = ?

E = P x t = 615 W x 50400 s = 30 996 000 J

That’s it!!

Good Luck!!