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Science 8 First Quarter > Lesson 7 Electricity > Flashcards

Lesson 7 Electricity Flashcards

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1
Q

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

A

Voltage

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2
Q

What is the si unit of voltage

A

Volt

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3
Q

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

A

Current

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4
Q

What is the si unit of current

A

Ampere

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5
Q

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

A

Resistance

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6
Q

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

A

Electric current (I)

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7
Q

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

A

Electrons

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8
Q

What makes an electrical charge move.

A

Voltage

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9
Q

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

A

Electrical resistance

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10
Q

What metal is used for conducting electrical wires.

A

Copper wires

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11
Q

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

A

Conductivity

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12
Q

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

A

Ohm

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13
Q

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

A

Resistor

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14
Q

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

A

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

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15
Q

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.

A

GEORG SIMON OHM

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16
Q

The greater the voltage the greater the ___.

A

Current

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17
Q

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

A

3 ohms (letter omega as its symbol)

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18
Q

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

A

200V

19
Q

A closed loop through which current can flow.

A

Electrical circuit

20
Q

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

A

Battery

21
Q

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.

A

Electrical switch

22
Q

An electrical device that converts electrical energy to heat.

A

Electrical load/bulb

23
Q

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.

A

Conducting wires

24
Q

A type of a circuit that only has one path.

A

Series circuit

25
Q

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.

A

True

26
Q

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

A

False-Increases

27
Q

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

A

Parallel circuit

28
Q

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

A

True

29
Q

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

A

True

30
Q

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

A

Voltage regulator

31
Q

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

A

Circuit breaker

32
Q

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

A

Fuse

33
Q

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

A

✓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.

34
Q

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.

A

Electrical hazard or electrical shock

35
Q

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

A

Electrical fault

36
Q

What is some warning signs of electrical hazard give some.

A
  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
37
Q

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.

A

Short circuit

38
Q

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.

A

Grounded circuit

39
Q

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.

A

Automatic voltage regulator (AVR)

40
Q

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

A

Uninterruptible power supply (UPS)

41
Q

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.

A

Circuit breaker

42
Q

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.

A

Fuse

43
Q

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.

A

Earthing or Grounding

44
Q

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.

A

Double insulation

Science 8 First Quarter (7 decks)

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