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Science > Physics (feb mocks) > Flashcards

Physics (feb mocks) Flashcards

1
Q

In a series circuit, what happens to the voltage?

A

Voltage is shared, total voltage is all voltages added together

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2
Q

In a series circuit, what happens to the current?

A

Current is the same throughout the circuit

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3
Q

In a parallel circuit, what happens to the voltage?

A

Voltage is the same throughout the circuit

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4
Q

In a parallel circuit, what happens to the current?

A

Current is shared, total current is all currents added together

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5
Q

Are ammeters connected in series or parallel? What do they measure?

A

Series, current

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6
Q

Are voltmeters connected in series or parallel?

A

Parallel, voltage

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7
Q

What is resistance? What is it measured in?

A

The opposition to current flow, ohms

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8
Q

What does ohms law state?

A

There is a directly proportional relationship between current and potential difference, provided the temperature stays the same

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9
Q

How do you calculate voltage?

A

Voltage = current x resistance

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10
Q

How do you calculate resistance?

A

Resistance = voltage/current

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11
Q

How do you calculate current?

A

Current = voltage/resistance

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12
Q

In series, what happens when adding multiple resistors?

A

resistance increases and current decreases as more are added?

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13
Q

In parallel, what happens when adding multiple resistors?

A

Resistance decreases and current increases as number of resistors increases

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14
Q

How can energy be transferred in a circuit?

A

mechanically (by a force), electrically, by heating or by radiation

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15
Q

What are 5 energy stores?

A 
Chemical (food, fuel), 
GP (objects in high positions), 
EP (stretched, squashed or twisted objects, 
thermal (in hot objects)  
kinetic (moving objects)
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16
Q

What is dissipation?

A

Energy transferred to the environment by heat, sound or light

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17
Q

What is direct current?

A

Electrical charged pushed in ONE DIRECTION around a circuit

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18
Q

What is alternating current?

A

where the direction of current keeps changing

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19
Q

Which, A.C or D.C, supplies mains electricity

A

AC

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20
Q

How to calculate power (voltage)?

A

Power = current x voltage

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21
Q

What is power measured in?

A

Watts (W)

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22
Q

What is energy transferred measured in?

A

Joules (J)

23
Q

How to calculate power (resistance)?

A

Power = current^2 x resistance

24
Q

How to calculate power?

A

Energy transferred/time

25
Q

How to calculate Kinetic energy?

A

KE = 1/2 x mass x velocity^2

26
Q

How to calculate GPE?

A

GPE = mass x gfs x height

27
Q

How to calculate weight?

A

Mass x gfs

28
Q

What is the unit for weight?

A

Newtons

29
Q

Which is a force: mass or weight?

A

Weight

30
Q

Does mass change at different places in the universe?

A

No, it is the same everywhere

31
Q

What is gravity and what factors affect it?

A

The force of attraction between two objects, mass and distance

32
Q

What are the units for GPE and KE?

A

Joules

33
Q

What is work done?

A

How much energy occurs when a force is used to move an object by a distance

34
Q

How do you calculate work done?

A

work done = force x distance

35
Q

How do you calculate power (work done)?

A

Power = work done/time

36
Q

Where is the magnetic field strongest?

A

Closer to the magnet’s poles

37
Q

What direction do magnetic fields always point?

A

North to South

38
Q

What is the motor effect?

A

A current carrying wire in presence of a magnetic field will experience a force, wire has to be perpendicular

39
Q

How do you measure force (magnetic flux)?

A

Force = magnetic field strength x current x length

40
Q

What is magnetic flux density?

A

Magnetic field strength

41
Q

What is the magnetic field like inside a solenoid?

A

Strong and uniform

42
Q

What is the magnetic field like outside a solenoid?

A

Weak (cancel out)

43
Q

How do you increase the magnetic field strength?

A

Increase current, turn coil more times, use a shorter wire with the same amount of turns, add a soft iron core

44
Q

What is a fuse? Benefits and drawbacks?

A

A thin wire which melts to break the circuit when the current gets to high. Simple and cheap but has to be replaced

45
Q

What is newtons first law?

A

A resultant force is required to change the motion of an object, if resultant force is zero then a stationary object will remain stationary and a moving object will continue moving at the same velocity

46
Q

What is inertia?

A

Where there is no change on the movement of an object

47
Q

What is Newtons second law?

A

if a non-zero resultant force acts on an object, then it will cause it to accelerate. The size of a resultant force is directly proportional to the acceleration is causes

48
Q

How to measure force?

A

Force = mass x acceleration

49
Q

What is resultant force?

A

The overall force when two or more forces are acting on an object (in a direction)

50
Q

What is Newtons third law?

A

When 2 objects interact, the forces they exert are equal and opposite to each other. Equal in magnitude and opposite in direction.

51
Q

What does friction do?

A

Slows down moving objects

52
Q

What is upthrust?

A

Upwards fore in a fluid

53
Q

What is magnetic flux density measured in/?

A

Teslas

54
Q

Left hand rule

A

thumb - force
index - field
middle - current

Science (5 decks)

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