Physics

Question 1

energy is always what?

Answer 1

conserved.

Question 2

energy can be transferred between what?

Answer 2

stores.

Question 3

what is charge?

Answer 3

a fundamental property of the material in the universe.

Question 4

what is the units for charge?

Answer 4

coulombs.

Question 5

is charge a scalar or vector?

Answer 5

scalar

Question 6

what is the symbol for charge?

Answer 6

Q.

Question 7

what is an electric field?

Answer 7

a region of space where charges experience an electrical flow.

Question 8

what is the direction of an electric field?

Answer 8

the direction of the force experienced by a positive charge in the field.

Question 9

what is a conductor?

Answer 9

a material in which charge carriers can move.

Question 10

what is an insulator?

Answer 10

a material in which charge carriers cannot move.

Question 11

what is the unit for current?

Answer 11

ampere (A).

Question 12

what is the symbol for current?

Answer 12

I.

Question 13

what does 1 volt equal?

Answer 13

1 joule per coulomb.

Question 14

what is the unit for potential difference?

Answer 14

the volt (V)

Question 15

what is the symbol for potential difference?

Answer 15

V.

Question 16

what is a series circuit?

Answer 16

a circuit in which the components are connected one after another.

Question 17

what is a parallel circuit?

Answer 17

a circuit in which components are connected side by side.

Question 18

what is resistance?

Answer 18

a measure of the opposition flow of charge in an electrical circuit.

Question 19

what happens to the current in a circuit when the resistance increases?

Answer 19

it decreases.

Question 20

what is a resistor?

Answer 20

an electrical component that has a resistance that remains approximately constant for different currents.

Question 21

what is the units for reistance?

Answer 21

ohms - greek letter omega.

Question 22

what is the symbol for resistance?

Answer 22

R.

Question 23

what happens to the current in a series circuit?

Answer 23

it is the same at all points in the circuit.

Question 24

what happens to the p.d in a series circuit?

Answer 24

the sum of the pd across all the components is equal to the total pd.

Question 25

what happens to the current in a parallel circuit?

Answer 25

the sum of the current across all the components is equal to the total current.

Question 26

what happens to the p.d in a parallel circuit?

Answer 26

it is the same across all the branches in the circuit.

Question 27

what is power?

Answer 27

the quantity of electrical energy changed to other forms each second.

Question 28

what is the units for power?

Answer 28

watts (W).

Question 29

what is the symbol for power?

Answer 29

P.

Question 30

what is d.c. current?

Answer 30

causes charge to move in only one direction.

Question 31

what is a.c. current?

Answer 31

causes charge to move one way then another way.

Question 32

give one example of d.c. current.

Answer 32

a battery.

Question 33

give one example of a.c. current.

Answer 33

mains electricity.

Question 34

what is a diode?

Answer 34

a device that allows electrons to flow in one direction only.

Question 35

what is a capacitor?

Answer 35

two metal plates separated by insulating material.

Question 36

what happens to the reading on the a.c. ammeter when the frequency of the a.c. supply in increased?

Answer 36

it increases.

Question 37

what is the behaviour of a capacitor in an d.c. circuit?

Answer 37

the voltage reading across the capacitor gradually increases to the supply voltage.

Question 38

name some possible uses of a capacitor.

Answer 38

storing energy, reducing voltage variation, blocking dc while passing ac.

Question 39

what is the purpose of a capacitor?

Answer 39

to provide energy quickly.

Question 40

give three examples of an input devices.

Answer 40

microphone, thermistor, LDR.

Question 41

give three examples of an output devices.

Answer 41

LED, buzzer, motor.

Question 42

what is the energy change in input devices?

Answer 42

(BLANK) to electrical energy.

Question 43

what is the energy change in output devices?

Answer 43

electrical energy to (BLANK).

Question 44

how do you use a LED in a circuit?

Answer 44

energy flows from negative to positive = correct.

Question 45

whats a transistor?

Answer 45

a very fast electronic switch, used for automatic control of electronic circuits.

Question 46

what is distance?

Answer 46

the length of the path followed by the object.

Question 47

what is displacement?

Answer 47

the length of a straight line from the objects start to end point.

Question 48

what is speed?

Answer 48

a measure of how quickly an object travels a certain distance.

Question 49

what is velocity?

Answer 49

the speed and direction of an object.

Question 50

what is acceleration?

Answer 50

how quickly the velocity of an object is changing.

Question 51

what is the resultant?

Answer 51

the sum of two or more vectors.

Question 52

what is force?

Answer 52

an interaction between the materials of our universe.

Question 53

what is weight?

Answer 53

the gravitational force acting on an object.

Question 54

what is mass?

Answer 54

a fundamental property of all material in the universe.

Question 55

what is gravitational field strength?

Answer 55

the gravitational force acting on a unit of mass.

Question 56

what is kinetic model?

Answer 56

a term used to describe the motion of particles inside a solid liquid and gas.

Question 57

what is the temperature of a substance?

Answer 57

a measure of the mean kinetic energy of its particles.

Question 58

what is the heat of a substance?

Answer 58

the total kinetic energy of the particles contained in a substance.

Question 59

what is 0 degrees kelvin in celcius?

Answer 59

-273.

Question 60

how do you work out kelvin from celcius?

Answer 60

add 273.

Question 61

what is the relation ship between specific heat capacity mass heat energy and temperature change?

Answer 61

Eh=cm(delta)t.

Question 62

what is pressure?

Answer 62

the force per unit area exerted on a surface.

Question 63

what is the relationship between force pressure and area?

Answer 63

P=F/A

Question 64

what is the relationship between temperature, volume and pressure of a fixed mass gas?

Answer 64

P1V1/T1=P2V2/T2