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Physics > Physics 2019 > Flashcards

Physics 2019 Flashcards

1
Q

What is the equation that connects velocity, distance and time

A

Velocity = distance/ time

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2
Q

What is the equation that links acceleration, speed at end, speed at start and time

A

Acceleration = speed at end - speed at start/ time

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3
Q

What is acceleration measured in

A

M/s2

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4
Q

What is an ammeter used for

A

To measure amps

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5
Q

What is a voltmeter used for

A

To measure volts (it is always set up in parallel)

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6
Q

How do you need to set up the voltmeter and ammeter to measure resistance

A

The voltmeter should be in parallel and the ammeter should be n series

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7
Q

What is the definition, symbol and unit for a current

A

It is the rate of flow of charge around a circuit, it’s symbol is I and it’s unit is AMPS

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8
Q

What is the definition, symbol and unit for Voltage (potential difference)

A

It is the force that pushes the current around the circuit, it’s symbol is V and it’s unit is VOLTS

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9
Q

What is the definition, symbol and unit for resistance

A

It is the measure of how much a material resists current , it’s symbol is R and it’s unit is OHMS

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10
Q

What is the symbol and unit for Colombs

A

It’s symbol is Q and it’s unit is C

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11
Q

What is the symbol and unit for Work done

A

Its symbol is W and it’s unit is JOULES

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12
Q

What is the symbol and unit for power

A

It’s symbol is P and it’s unit is WATTS

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13
Q

What is the equation for current in a series circuit

A

I =I1 = I2 = I3

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14
Q

What is the equation for current in a parallel circuit

A

I = I1+ I2 + I3

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15
Q

What is the equation for voltage in a series circuit

A

V = V1 + V2 + V3

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16
Q

What is the equation for voltage in a parallel circuit

A

V = V1 = V2 = V3

17
Q

What is the equation for resistance in a series circuit

A

R = R1 + R2 + R3

18
Q

What is the equation for resistance in a parallel circuit

A

1/R = 1/R1 + 1/R2 + 1/R3

19
Q

What is the equation linking current charge and time

A

Current = charge/ time

20
Q

What is the equation linking voltage, work done and charge

A

V = W/ Q

21
Q

What is the equation linking power, current and voltage

A

Power = current X voltage

22
Q

What is the equation linking voltage, current and resistance

A

Voltage = current X resistance

23
Q

True or False: in a series circuit current is constant

A

True

24
Q

What is the definition for Ohms 2nd law

A

The current flowing through a resistor at a constant temperature is directly proportional to the voltage across a resistor

25
Q

What is the equation linking resistance, voltage and current

A

R = V/ A

26
Q

What are the factors affecting resistance

A

. Material (some better conductors)
. Length (higher resistance for longer)
. Thickness (higher resistance for thicker)
. Temperature (higher resistance for hotter, ion vibration)

27
Q

True or False: a resistor follows Ohms law

A

True

28
Q

True or False: a filament follows Ohms law

A

False

29
Q

True or False: a diode follows Ohms law

A

False (current can only pass one way) , (doesn’t have current until 1.6V)

30
Q

What are the aspects of reflective materials that make them reflect so much light

A

. They have smooth shiny surfaces and are pale colours

. They give clearer images as they reflect light in regular patterns

31
Q

True or False: the angle of incidence = the angle of reflection

A

True

32
Q

How do you calculate the refractive index

A

Sin(angle of incidence) / Sin(angle of refraction)

33
Q

What is the equation for critiche angle

A

1/ Refractive index

34
Q

Give examples of everyday applications of total internal refraction

A

. Optical cable
. Automatic rain sensors
. Binoculars

Physics (2 decks)

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