Lesson 7 Electricity

Question 1

What is the difference in electric potential energy in joules per coulomb

Answer 1

Voltage

Question 2

What is the si unit of voltage

Answer 2

Volt

Question 3

___ is the number of charges passing through a wire per unit time.

Answer 3

Current

Question 4

What is the si unit of current

Answer 4

Ampere

Question 5

It is the opposition to the flow of electric charges as they travel through a conducting wire.

Answer 5

Resistance

Question 6

It is the rate of flow of electric charges from one point to another in a circuit.

Answer 6

Electric current (I)

Question 7

What type of atom that can only move in a conducting wire.

Answer 7

Electrons

Question 8

What makes an electrical charge move.

Answer 8

Voltage

Question 9

It is the opposition to the flow of a current by conducting wire. It depends on its thickness length and conductivity.

Answer 9

Electrical resistance

Question 10

What metal is used for conducting electrical wires.

Answer 10

Copper wires

Question 11

It is the form of matter that allows current to flow the higher the ___ of material the more electrons can freely flow

Answer 11

Conductivity

Question 12

Electrical resistance is measured in ___ with the Greek letter omega as its symbol.

Answer 12

Ohm

Question 13

An electronic device that is designed to resist the flow of current is known as ___.

Answer 13

Resistor

Question 14

The relationship between voltage current and resistance is summarized by ohm’s law which states that

Answer 14

The amount of electric current is directly proportional to the voltage applied to the circuit and inversely proportional to the resistance of the circuit.

Question 15

He discovered that at constant resistance electric current in a circuit is directly proportional to the voltage. He is also known for electrical resistance which is omhs.

Answer 15

GEORG SIMON OHM

Question 16

The greater the voltage the greater the ___.

Answer 16

Current

Question 17

Find the resistance of a single motor horn if it has a voltage of 6V and a current of 2A.

Answer 17

3 ohms (letter omega as its symbol)

Question 18

If a circuit has a resistance of 40 ohms and the current of 5A what is its voltage?

Answer 18

200V

Question 19

A closed loop through which current can flow.

Answer 19

Electrical circuit

Question 20

The voltage source, a voltage source is a device that maintains a constant amount of voltage.

Answer 20

Battery

Question 21

A device that can control the entrance of current when it is on the circuit is closed then current can pass through when it is off the circuit is open and current cannot pass through.

Answer 21

Electrical switch

Question 22

An electrical device that converts electrical energy to heat.

Answer 22

Electrical load/bulb

Question 23

A special kind of conductor where current can pass through easily there is a corresponding sale amount of current that can pass through for every size thickness or cross sectional area of conducting wire.

Answer 23

Conducting wires

Question 24

A type of a circuit that only has one path.

Answer 24

Series circuit

Question 25

True or false. If a series circuit is interrupted at any point in its single loop no current can flow through the circuit and no loads in the circuit will work. In short if a load is not working or damage the following loads will also not work.

Answer 25

True

Question 26

True or false and modify it. In a series circuit the more load is added the total resistance decreases.

Answer 26

False-Increases

Question 27

Another type of circuit where there is a multiple pathways for the current to flow

Answer 27

Parallel circuit

Question 28

True or false. In a parallel circuit if one loop is interrupted the current can still flow through the other loop.

Answer 28

True

Question 29

True or false. The more load is added in a parallel connection, the total resistance decreases while the total current increases.

Answer 29

True

Question 30

A device that maintains steady supply of voltage to your appliances at home.

Answer 30

Voltage regulator

Question 31

It is an electrical device that shuts down when there is overloading in the circuit.

Answer 31

Circuit breaker

Question 32

An electrical device that blows up when there is overloading in the circuit.

Answer 32

Fuse

Question 33

When dealing with electricity you must follow the following give some:

Answer 33

✓Always use dry hands in handling electrical equipment ✓Pull the flag of an electrical appliance not the cord ✓Do not use busted chords ✓Alwaysn consult a license professional in dealing with electrical connections.

Question 34

A condition due to direct or indirect electrical contact with an energized conductor or piece of equipment and from which a person may sustain electrical energy from shock or damage to property or both.

Answer 34

Electrical hazard or electrical shock

Question 35

This happens usually when a non-professional works and houses wiring or even professionals who have overloaded some important reminders in doing their job

Answer 35

Electrical fault

Question 36

What is some warning signs of electrical hazard give some.

Answer 36

1. Lights dim or flicker when another appliance is turned on 2. Appliances do not have permanent outlets 3. Many extension wires are utilized 4. Uses blowout or circuit breaker strip frequently

Question 37

Refers to a circuit condition in which a current takes the path of less resistance or zero resistance. Happens when there is an overloading of current making the conducting wire extremely hot that can cause the melting of insulators until 2 live wires come into contact.

Answer 37

Short circuit

Question 38

Refers to a circuit condition where current traveling from the positive conducting wire bypasses the negative conducting wire and flows through the metal casing of an appliance instead.

Answer 38

Grounded circuit

Question 39

An electrical safety device that is designed to protect our home appliances by regulating voltage automatically. It takes a fluctuating voltage level and returns it to a constant voltage level.

Answer 39

Automatic voltage regulator (AVR)

Question 40

An electrical safety device which provides emergency power to the load when there's an unexpected power disruption. It also functions like an AVR.

Answer 40

Uninterruptible power supply (UPS)

Question 41

An electrical safety device that uses electromagnets and bimetallic strips to open a switch in case of overloading. It automatically shuts down if there is overloading due to a short circuit. It cannot be turned on unless the short circuit is fixed.

Answer 41

Circuit breaker

Question 42

An electrical safety device that is made up of a metal ribbon that will heat up and melt if the current exceeds its current rating. Once the ___ is blown out, it must be replaced with a new one after the source of overloading is determined in repaired. It is unsafe to use a jumper wire since it may melt when there is a current overload.

Answer 42

Fuse

Question 43

A system of connecting the metal casing of the appliance to the earth. It prevents damage to appliances injury and the death of an electrical user.

Answer 43

Earthing or Grounding

Question 44

It is a safety measure done by appliance manufacturers to prevent the occurrence of electric shock and grounded external casing of appliances. Live wires within the appliances can attach the casing even if wires becomes loose, does eliminating the need for earthing.

Answer 44

Double insulation