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4th year Physics > National 5 EE > Flashcards

National 5 EE Flashcards

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1
Q

What is electric current?

A

The movement of a group of electrons around a circuit.

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2
Q

What is the equation involving charge, current and time?

A 
Current= charge/ time 
I= Q/t
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3
Q

What is the difference between alternating and direct current?

A

A.C is produced from the mains supply. The electrons flow around in one direction then the direction changes and the electrons flow in the opposite direction.
D.C is prodcued from a battery. The electrons always flow in one direction around the circuit

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4
Q

What is the effect of an electric field on a negative charge?

A

It would be accelerated towards the positive plate due to both replusion of the negative plate and the attraction to the positive plate.

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5
Q

What is the potential difference between two parallel charged plates?

A

A measure of the energy given to the charges when they move between the plates.

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6
Q

What is the equation involving resistance in series?

A

RT= R1+ R2+ R3

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7
Q

What is the equation involving resistance in parallel?

A

1/RT= 1/R1+ 1/R2+ 1/R3

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8
Q

What is the equation involving potential difference, current and resistance?

A 
Voltage= current x resistance
V= I x R
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9
Q

What is the equation involving potential difference and resistance in potential divider circuits?

A

V1/ V2= R1/ R2

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10
Q

What is a transistor?

A

A process device that acts as an automatic switch (voltage operated)

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11
Q

What is the difference between heat energy and temperature?

A

Heat: a form of energy and is measured in joules.
Temperature: a measure of how hot or cold something is and is measured in degrees celsius.

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12
Q

What is the temperature of a substance?

A

A measure of the average kinetic energy of the particles in that substance.

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13
Q

What is meant by the specific heat capacity of a substance?

A

The amount of heat energy required to change the temperature of 1kg of a substance by 1°C.

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14
Q

What is the equation involving specific heat capacity?

A

Heat energy= specific heat capacity x mass x change in temperature
Eh= cm (Delta) T

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15
Q

What is the Principle of Conservation of Energy?

A

Energy cannot be created or destroyed. Energy is always conserved (it can be changed from one form into another)

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16
Q

What is the unit of energy?

A

Joules (J)

17
Q

What are examples of energy transformations?

A

Light bulb: electrical energy—-> light energy (and heat energy)
Hoover: electrical energy—-> kinetic energy (and sound energy)

18
Q

What is the symbol for work done?

A

Ew

19
Q

What is the equation involving work done, force and displacement?

A

Work done= force x displacement

Ew= F x s

20
Q

What is gravitational potential energy?

A

The work done against gravity.

21
Q

What is the symbol for potential energy?

A

Ep

22
Q

What is the equation involving potential energy, mass, gravitational field strength and height?

A

Potential energy= mass x gravitational field strength x height
Ep= m x g x h

23
Q

What kind of energy does a moving object have?

A

Kinetic energy

24
Q

What is the symbol for kinetic energy?

A

Ek

25
Q

What is the equation involving kinetic energy, mass and velocity?

A

Ek= 1/2 x m x v squared

26
Q

What is pressure?

A

The force exerted on a surface per one metre squared

27
Q

What is the unit of pressure?

A

Nm-2

Pascals, Pa

28
Q

What is the equation involving pressure, force and area?

A 
Pressure= force/ area
P= F/A
29
Q

What is the general gas equation?

A

p1 x V1/ T1 = p2 x V2/ T2

30
Q

What is absolute zero?

A

-273°C is 0 on the Kelvin temperature scale.

At absolute zero, all particle motion stops and this is therefore the lowest possible temperature.

31
Q

How to you convert degrees celsius into kelvin?

A

Add 273

32
Q

How to you convert kelvin into degrees celsius?

A

Subtract 273

4th year Physics (14 decks)

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