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Physics > P4 - Electric Circuits > Flashcards

P4 - Electric Circuits Flashcards

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1
Q

A Circuit Diagram shows you how the Components in a _________ are connected together.

A

Circuit.

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2
Q

Every Component has its own _________.

A

Symbol.

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3
Q

A Cell is necessary to push ____________ around a Complete Circuit.

A

Electrons.

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4
Q

A __________ Consists of Two or More Cells.

A

Battery.

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5
Q

The (+) Symbol next to the long Line of the Cell indicates what?

A

It is the Positive Terminal of the Cell.

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6
Q

A __________ Enables the Current in a Circuit to be Switched ‘On’ or ‘Off’.

A

Switch.

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7
Q

A Light-Bulb is designed to emit ________ as a Signal when a Current passes through it.

A

Light.

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8
Q

A Diode allows __________ through in One Direction only.

A

Current.

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9
Q

A Light-Emitting Diode (____) emits Light when a Current passes through it.

A

LED.

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10
Q

An Ammeter is used to Measure Electric _________.

A

Current.

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11
Q

A Fixed Resistor Limits the _________ in a Circuit.

A

Current.

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12
Q

A Variable Resistor allows the __________ to be Varied.

A

Current.

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13
Q

A Fuse is designed to ‘break’ the Circuit if the __________ is greater than a Certain Amount.

A

Current.

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14
Q

A Heater is designed to Transfer the __________ from an Electric Current to _____ the surroundings.

A

Energy…Heat…

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15
Q

A Voltmeter is used to Measure Potential _____________ (Voltage).

A

Difference.

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16
Q

An Electric Current is a Flow of ________.

A

Charge.

17
Q

Each Electron carries a ____________ Charge.

A

Negative.

18
Q

Metals contain lots of Electrons that move freely between Positively ___________ Metal Ions.

A

Charged.

19
Q

The Size of an Electric __________ is the Rate of _____ of Electric Charge.

A

Current…Flow…

20
Q

The Bigger the Number of Electrons that pass through a ________________ each Second, the Bigger is the Current passing through it.

A

Component.

21
Q

What is Electric Charge Measured in (C)?

A

Coulombs.

22
Q

What is Electric Current Measured in (A)?

A

Amperes (Amps).

23
Q

What is the Equation for Electric Current of a Circuit?

A

Current (I) = Charge Flow (Q) / Time Taken (T)

24
Q

What is the Equation for Potential Difference across a Component?

A

V = Energy Transferred (Joules) / Charge (Coulombs)

25
Q

What is the Equation for Resistance?

A

Resistance (R) = Potential Difference (V) / Current (I)

26
Q

What is the Unit of Resistance?

A

Ohms.

27
Q

The Larger the Resistance of a Resistor, the _________ the Current.

A

Smaller.

28
Q

The Current through a Resistor at Constant Temperature is Directly _______________ to the Potential Difference across the Resistor.

A

Proportional.

29
Q

What is a Wire also known as?

A

An Ohmic Conductor.

30
Q

Reversing the Potential Difference across a ____________ reverses the Current through it.

A

Resistor.

31
Q

What is the Resistance of an Appliance (Equation Symbols)?

A

R = V/I

32
Q

A Filament Lamp’s Resistance _____________ if the Filament’s Temperature Increases.

A

Increases.

33
Q

What is a Diode also known as?

A

A Non-Ohmic Calculator.

34
Q

In a Diode, the Forward Resistance is ____, and the Reverse Resistance is _____.

A

Low…High…

35
Q

LEDs are used in Indicators such as Battery ___________ and Alarm Circuits.

A

Chargers.

36
Q

Thermistors and Light-Dependent Resistors are used in _______ Circuits.

A

Sensor.

37
Q

A Thermistor is a Temperature-Dependent ___________ and its Resistance ______________ if its Temperature Increases.

A

Resistor…Decreases…

38
Q

The Resistance of a Light-Dependent Resistor (____) Decreases if the Light ____________ Increases.

A

LDR…Intensity…

Physics (18 decks)

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