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Physics Unit 2 > 2.3 Currents in Electrical Ciruits > Flashcards

2.3 Currents in Electrical Ciruits Flashcards

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1
Q

What is the current in an electrical circuit?

A

The flow of electric charge round a circuit

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2
Q

What is the potential difference/voltage?

A

The work done per coulomb of charge that passes between 2 points in a circuit

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3
Q

What are the characteristics of components connected in series?

A
  • The total resistance is the sum of the resistance of all the components in the circuit
  • The current is the same everywhere in the circuit
  • The total potential difference is shared between the components
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4
Q

What are the characteristics of components connected in parallel?

A
  • The potential difference across each component is the same
  • The total current through the whole circuit is the sum of the currents through the separate components
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5
Q

What does an LED do and what does it stand for?

A

Light Emitting Diode - emits light when a current flows through it in the forward direction

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6
Q

What does an LDR do and what does it stand for?

A

Light Dependant Resistor - The resistance decreases as light intensity increases

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7
Q

What does a thermistor do?

A

It’s a temperature dependant resistor, the resistance decreases as the temperature increases

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8
Q

How is static electricity made?

A

Insulating materials are rubbed against each other. Electrons move from one material to the other. One material is positively charged and the other is negatively charged

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9
Q

What happens to objects that carry the same charge?

A

They repel

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10
Q

What happens to objects that have different charges?

A

They attract

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11
Q

What is the unit for current?

A

A (Amps)

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12
Q

What is the unit for voltage?

A

V (Volts)

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13
Q

What is the unit for resistance?

A

Ohms

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14
Q

What does the current-voltage graph look like for a resistor?

A
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15
Q

What does the current-voltage graph look like for a filament lamp?

A
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16
Q

What does the current-voltage graph look like for a diode?

A
17
Q

How can the resistance of a component be found?

A

By measuring the current through and the potential difference across the component

18
Q

What is this?

A

Switch

19
Q

What is this?

A

Cell

20
Q

What is this?

A

Battery

21
Q

What is this?

A

Diode

22
Q

What is this?

A

Resistor

23
Q

What is this?

A

Variable resistor

24
Q

What is this?

A

Lamp

25
Q

What is this?

A

Fuse

26
Q

What is this?

A

Voltmeter

27
Q

What is this?

A

Ammeter

28
Q

What is this?

A

Thermistor

29
Q

What is this?

A

LDR

30
Q

What is this?

A

LED

Physics Unit 2 (6 decks)

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