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Physisc Year-10 > Circuits > Flashcards

Circuits Flashcards

1
Q

What is current

A

A rate of flow of electrical charge

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2
Q

How many seconds does it take for a electrical charge to flow

A

Per second

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3
Q

What is current measured in

A

Amps (A)

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4
Q

What charges flow in a circuit

A

Electrons

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5
Q

What is charged measured in

A

Coulombs (C)

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6
Q

What is Potential differences (p.d)

A

It is the energy transferred per unit charge

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7
Q

What is p.d measured in

A

Volts

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8
Q

What is resistance

A

An material’s opposition to electric current

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9
Q

What is resistance measured in

A

Ohms

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10
Q

What is the equation

A

Resistance (ohms) = p.d (V) / current (A)

R=V/I

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11
Q

What does the cell provide in the circuit

A

P.d

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12
Q

In a circuit what does the battery have

A

Two or more cells connected together

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13
Q

What does a Fixed resistor do in a circuit

A

Used to restrict the amount of current in the circuit. The greater the resistance the smaller the current

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14
Q

What does a variable resister do

A

It can have different values of resistance

Vary the amount of currents in the circuit

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15
Q

What is an ammeter

A

record amount of current in the circuit.

connected in series with components

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16
Q

What is a voltmeter

A

records the p.d across a component.

must be placed in parallel with the component

17
Q

Fixed resister

A

It’s a resister or a wire at constant temperature
Obeys the Ohms Law - this means that current is directly proportional to p.d

(Resistance stays constant it temperature is constant)

18
Q

Filament Lamp

A

It will not obeys Ohms Law
As the p.d is increased the temperature will increase - this means that ions in the metal filament vibrate more and restrict the flow of electrons - will increase the resistance

19
Q

Diode

A

In the forward direction current can flow but in the reverse the component has a very high resistance and only a tiny current can flow - this means that a diode will only allow current to travel one way round the circuit.

20
Q

LED - lights emitting Diode

A

Emits light when a current passes through it in a forward direction.
Used in indicators as electrical device

21
Q

LDR - light dependent Resister

A

Sensitive to light levels
In light the resistance is low in the dark it is high
Used as a sensor to control other devices

22
Q

Thermistor

A

Sensitive to temperature
Resistance is low at high temperature - high in low temp
Used to switch the heating on and off

23
Q

In a series circuit is current the same through each component

A

Yes

24
Q

What cell is shared between the components

A

Pd

25
Q

What does the pd of the cell equal to across the component

A

Sum of pds

26
Q

Do resistors in series add up

A

Yes

Physisc Year-10 (3 decks)

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