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Physics 10 > Electric Current And Circuits > Flashcards

Electric Current And Circuits Flashcards

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1
Q

What is a cell and learn symbol?

What is the battery and learn symbol?

A

A cell pushes electrons around a circuit.
A battery consists of 2 or more cells.
+ symbol indicates the positive terminal of the cell
- symbol indicates the negative terminal of the cell

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2
Q

What is a switch and learn its symbol?

A

A switch enables current in the circuit to be switched on and/or off

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3
Q

What is a lamp or bulb and it’s symbol?

A

An indicator such as a bulb designed to emit light when a current passes through it

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4
Q

What is a diode and it’s symbol?

A

A diode allows current through in one direction only

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5
Q

What is an LED and it’s symbol?

A

Light emitting diode

Emits light when a current passes through it

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6
Q

What is an ammeter and it’s symbol?

A

An ammeter measures electric current in amps

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7
Q

What is a resistor and it’s symbol?

A

A fixed resistor limits a current in a circuit

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8
Q

What is a variable resistor and it’s symbol?

A

Allows current to be varied

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9
Q

What is a fuse and it’s symbol?

A

A fuse is designed to melt and therefore break the circuit if the current going through it is greater than a certain amount

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10
Q

What is a voltmeter and it’s symbol?

A

A voltmeter is used to measure potential difference in volts or voltage

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11
Q

What is a thermistor and a LDR and learn symbols?

A

Thermistor = a temperature-dependent resistor and its resistance decreases if its temperature increases (and increases if its temperature decreases)

LDR - a light-dependent resistor and its resistance decreases if its light intensity increases (and increases if its light intensity decreases)

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12
Q

What is electric current?

A

A flow of electric charge

The size of current is rate of flow of electric charge

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13
Q

How do we measure current - equation?

A

Current (A)= charge(C)➗time(s)

I=Q➗T

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14
Q

If a charge of 6C flows through a bulb in 2 seconds what current flows?

A

I= Q/T
I=6/2
I=3A
Current is measured in amps

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15
Q

A current of 3A flows through a bulb for 10 seconds.

How much charge has passed through in this time?

A 
I=Q/T
3=Q/10
Q=3x10
Q=30C
Charge is measured in coulombs
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16
Q

A current of 6A is flowing.

How long does it take for 60C to flow through the point?

A

T=Q/I
T=60/6
T=10 seconds
Time is measured in seconds

17
Q

How does current move?

A

Electrons move from the negative terminal of a cell to the positive terminal of a cell

18
Q

What was conventional current?

A

Conventional current was when current flowed from the positive terminal to the negative terminal of a cell

19
Q

How is the current through a component measured by?

A

It is measured by an ammeter alongside the component

20
Q

What is Ohms law?

A

The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor

21
Q

Explain current in s series circuit

A

In a series circuit the same current passes through each component

22
Q

Explain potential difference in a series circuit

A

In a series circuit the total potential difference of the power supply is shared between the components

23
Q

What happens if you use more than one cell in a circuit

A

The total potential difference of cells in series is the sum of the potential difference of each cell

24
Q

What is the resistance rule for components in series

A

The total resistance of 2 or more components in series is equal to the sum of the resistance of each component
Rt=R1+R2

25
Q

Why does the resistance of several resistors in series increase if an additional resistor is connected

A

Adding more resistors in series increases the total resistance because the current through the resistors is reduced and the total potential difference across them is unchanged

26
Q

How is current measured in parallel circuits

A

The total current through the whole circuit is the sum of the currents through the separate branches

27
Q

Explain potential difference in a parallel circuit

A

For components in parallel the potential difference across each component is the same

28
Q

How does current change in parallel circuits each with a different resistor

A

The bigger the resistance of the component the smaller the current through it
I= V/R

29
Q

What is the rule for resistors in parallel

A

The total resistance of 2 or more components in parallel is less then the resistance of the resistor with the least resistance
The total potential difference is unchanged

Physics 10 (15 decks)

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