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Science > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is electrostatics?

A

The study of charges at rest.

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2
Q

What are examples of static electricity?

A

Lightening
Spray painting
Photocopies
Van der Graf generator

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3
Q

According to what theory does electric current move from the positive terminal to the negative terminal.

A

Conventional theory

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4
Q

How does a battery become ‘flat’?

A

As the cell is used, the original chemicals change and are used up, while new substances are formed. When all the chemicals have reacted, the cell no longer supplies electrical energy

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5
Q

What is the energy transformation in a cell?

A

Chemical to electrical

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6
Q

What is current?

A

Current is the rate of flow of charge around a circuit

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7
Q

What is current measured in

A

Amperes

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8
Q

How are ammeters connected and why?

A

Ammeters are connected in series and have low resistance in order to not altar the current of a circuit to a great extent.

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9
Q

What are the 3 factors that must be meant in order for current to flow?

A

A circuit must be closed in order for current to flow

There must an electrical energy source

There must be resistance

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10
Q 
Draw the symbols of the following:
Cell
Battery 
Conductor 
Open switch 
Closed switch 
Resistor 
Voltmeter
Light bulb 
Ammeter
A

in book

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11
Q

What is charge?

A

The amount of electrons that are moving in the circuit?

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12
Q

What is a coulomb?

A

The amount of charge that passes a point per second in a circuit when the current is 1 ampere.

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13
Q

What is the elemental charge?

A

One electron minus is equal to 1, 6×10 to the -19 C

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14
Q

How is current in a series vs parallel?

A

Current in a series circuit is the same throughout, whereas current is split/shared in a parallel circuit

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15
Q

What happens when resistors are added In series vs parallel?

A

In series as resistance increases current decreases (resistance is inversely proportional to current)

In parallel; as restores are added, overall resistance in the circuit decreases and therefore current increases.

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16
Q

What is potential difference?

A

Potential difference is the difference in electrical potential energy per unit charge between to points in a circuit.

17
Q

Why are voltmeters always connected in parallel?

A

Voltmeters have high resistance, therefore would stop or slow current in series.

Required to measure potential difference across two points (either side of the resistor) in the circuit

18
Q

What happens to voltage in a parallel vs series circuit?

A

Voltage is shared between resistors in series.

Voltage is not shared between resistors in parallel.

19
Q

What relationship does voltage have to resistance?

A

Voltage is directly proportional to resistance. If the amount of resistance of a resistor goes up, the amount of voltage drawn from the battery will also increase

20
Q

What is resistance?

A

A materials opposition to the flow of electric energy

21
Q

What are the 2 factors that affect the resistance in a circuit?

A

The resistance of the conductor

The resistance of the resistors in the circuit

22
Q

What is the relationship between resistance and current?

A

They are inversely proportional. As resistance increases, the amount of current decreases.

23
Q

What is the relationship between resistance and voltage?

A

They are directly proportional. As resistance increases, voltage increases

24
Q

Tabulate the differences between current, voltage and restrictions in a series vs parallel.

A

In book

25
Q

What is ohms law?

A

The current flowing through a conductor is directly proportional to the voltage across the conductor provided the resistance remains constant.

26
Q

What are the factors that effect ohms law?

A

Length of the conductor: longer the conductor the more resistance to the flow of current

Thickness(diameter):the thicker the conductor, the less resistance to flow of current

Temperature: the hotter the conductor, the less

27
Q

What happens to total resistance in parallel vs series?

A

In series the total resistance increases

In parallel the total resistance decreases

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