Topic 1,2,3

Question 1

What is induction

Answer 1

Using charged object to force charges in an uncharged object to move

Question 2

Current is

Answer 2

The rate of flow of charge around the circuit.

Will only flow through a component if there is a voltage across that component

Question 3

What is voltage

Answer 3

(Potential difference) is the driving force that pushes the current round
Like “electric pressure”

Question 4

What is resistance

Answer 4

Anything in the circuit which slows the flow down

Ohms

Question 5

What happens if u increase resistance

Answer 5

Less current will flow

Question 6

What happens if you increas the voltage

Answer 6

More current will flow

Question 7

Potential difference is

Answer 7

The energy transferred per unit charge passed

Question 8

What happens when an electrical charge goes through a change in potential difference

Answer 8

Energy is transferred

Question 9

What happens when the charge reaches a component in the circuit

Answer 9

It gives up its energy when it ‘falls’ through any voltage drop

Question 10

The bigger the voltage of the battery

Answer 10

The energy that will be supplied to the circuit for every coulomb of charge which flows around it
As charge is raised “higher” at the start so more will be displaced

Question 11

Current is ……..In a circuit (and junction)

Answer 11

Conserved

Question 12

Ammeter is in a ……

Answer 12

Series

In line with a component

Question 13

What kind of circuit must a voltmeter be in

Answer 13

Parallel around the component under test

Question 14

Component, ammeter and variable resister are in a series so can be placed in…….
Whereas voltmeter must me in…..

Answer 14

Any order

Parallel

Question 15

Resistance of an LDR in bright light and darkness

Answer 15

Bright-resistance falls

Darkness-resistance highest

Question 16

A thermistor in hot and cold conditions

Answer 16

Hot-resistance drops

Cold-resistance goes up

Question 17

What happens when there is an electrical current in a resistor

Answer 17

Energy transfer which heats the resistor
Due to electrons colliding with ions in the lattice that make up the resistor as they move through
Giving ions extra energy, emitted by heat, increasing resistors resistance

Question 18

Problems with electrical current

Answer 18

Heating effect makes electrical circuits less efficient as energy wasted as heat
Cause components to melt, circuit stop working or not properly

Question 19

How do fuses protect circuits

Answer 19

They melt and break the circuit if the current get too high

Question 20

Give an example of where the heating effect of resistors if good

Answer 20

Toasters continue coil of wire it’s high resistance
Current passes through and temp increases so glows giving of infrared (heat) radiation which cooks bread
Also lightbulbs

Question 21

The difference between speed and velocity

Answer 21

Speed is how fast you’re going with no regard for direction

Velocity must also have direction specified. The distance in a particular direction is called DISPLACEMENT

Question 22

Acceleration is

Answer 22

How quickly the velocity is changing

Can be change in speed or direction or both

Question 23

Both acceleration and velocity (and displacement) are vector quantities so have

Answer 23

Magnitude and direction

Question 24

In a distance time graph gradient =

Answer 24

Speed

Question 25

In a velocity time graph, gradient =

Answer 25

Acceleration

Question 26

In a velocity time graph the distance travelled equal to

Answer 26

The area under the graph

Question 27

In stationary objects all forces are

Answer 27

Balanced due to gravity (or weight) acting downwards causing a reaction force from the surface pushing the object back up Equal horizontal forces to prevent acceleration

Question 28

In steady horizontal velocity and steady vertical velocity all forces

Answer 28

Must be balanced | Off unbalanced causes excels ration not steady speed

Question 29

Horizontal and vertical acceleration causes forces to be

Answer 29

Unbalanced Length of arrow longer showing overall resultant force Perpendicular direction forces are still balanced

Question 30

What is weight and what is it caused by

Answer 30

Force measured in newtons (N) Caused by full of gravity Will be different anywhere in universe

Question 31

Mass is not

Answer 31

A force Is the amount of 'stuff' in an object Same value anywhere in universe Measured in kilograms

Question 32

Falling objects in a vacuole accelerate at

Answer 32

The same rate

Question 33

A vacuum is a place

Answer 33

That doesn't contain any matter

Question 34

The accelerating force acting on all objects is

Answer 34

Gravity

Question 35

Why do two objects fall at the same rate in space(vacuum)

Answer 35

Because there is no air in a vacuum so no air resistance to slow down the falling objects

Question 36

How does terminal velocity accure

Answer 36

On earth when an object first sets of they have more force accelerating them than resistance slowing them down As speed increases as does air resistance Reducing acceleration so that thus forces are equal When balanced object won't accelerate any more has reached maximum speed or terminal velocity

Question 37

What happens if object a exerts a force on object B

Answer 37

Object B exerts the exact opposite force on object A

Question 38

What is action and reaction forces

Answer 38

Action- you pushing something e.g shopping trolly | Reaction- trolley pushing back against you

Question 39

What happens if there is zero resulting force acting on a body (forces are balanced)

Answer 39

Body will remain at rest or else if already moving will carry on at the same velocity

Question 40

When something is moving at a constant velocity then

Answer 40

The forces on it must be balanced | No resultant force

Question 41

To keep going at a steady speed the must be

Answer 41

Zero resultant force

Question 42

If the resulting force acting on a body is not zero (not equal)

Answer 42

It will accelerate in the direction of the resultant force (or decelerate)

Question 43

Name the five different forms of acceleration

Answer 43

``` Starting Stopping Speeding up Slowing down Changing direction ```

Question 44

Name three factors effecting the rate of acceleration

Answer 44

Bigger resultant force, greater acceleration or deceleration Bigger mass of object, smaller a creation To get big mass to accelerate as fast as a small mass needs bigger resultant force