Electricity

Question 1

What do switches do?

Answer 1

They used to turn circuit on (closed) or off (open)

Question 2

What is a lamps function?

Answer 2

An electrical current heats the filament in a bulb so that it gives out light

Question 3

What is the function of a fixed resistor? And what is its resistance like ?

Answer 3

It restricts or limits the flow of electrical current and it has an unchanging resistance

Question 4

What is the function of a variable resistor?

Answer 4

By moving the position of the slider, it changes the resistance

Question 5

What is the function of a thermistor ?

Answer 5

The resistance depends on the temperature as the temperature increases the resistance decreases

Question 6

Tell me about resistance in a light dependent resistor

Answer 6

Resistance depends on light low light levels, high resistance

Question 7

What does a diode do?

Answer 7

It allows current to only flow in One Direction. It is used to convert an alternating current into a direct current.

Question 8

What is a direct current?

Answer 8

When the flow of electrons is in one direction

Question 9

What is alternating current?

Answer 9

When the direction of electron flow continually reverses

Question 10

Where should the ammeter be placed in order to measure current?

Answer 10

In series of that component

Question 11

What is electric current ?

Answer 11

The rate of flow of electric charge

Question 12

What is the equation linking charge time and current?

Answer 12

Charge=current x time or Q= I x T

Question 13

What is charge measured in?

Answer 13

Coulombs (c)

Question 14

What is current measured in?

Answer 14

Amps (A)

Question 15

What is potential difference also referred as?

Answer 15

Voltage

Question 16

How do you measure potential difference?

Answer 16

You place it in parallel to the component

Question 17

What is potential difference?

Answer 17

A measure of energy per unit of charge transferred between two points in a circuit

Question 18

How do you measure potential difference using energy and charge?

Answer 18

Energy divided by charge or E divided by Q

Question 19

How do you measure potential difference using current and resistance?

Answer 19

Current x resistance

Question 20

What is resistance measured in?

Answer 20

Ohms

Question 21

Finish the sentence: one volt is the potential difference when one coulomb of charge transfers

Answer 21

One joule of energy

Question 22

Do conductors have a higher low resistance?

Answer 22

Low

Question 23

What is the current like in a fixed resistor?

Answer 23

Directly Proportionate to the potential difference

Question 24

What is the current like in a Filament bulb?

Answer 24

It doesn’t increase as fast as the potential difference

Question 25

What does more energy mean in terms of resistance in a filament bulb?

Answer 25

The resistance of the bulb increases

Question 26

How does the resistance increase in a filament bulb when the temp is increased?

Answer 26

A higher temp increases vibrations of ions in the filament making it harder for the electrons to pass through

Question 27

What happens if the potential difference is arranged to push the current the wrong way (reverse bias) in a diode

Answer 27

No current will flow

Question 28

When will current flow in a diode?

Answer 28

If the potential difference is forward biased

Question 29

1 amp = 1….

Answer 29

Coulomb Per second

Question 30

What are the properties of a series circuit?

Answer 30

The current is constant potential differences shared between components and the total resistance is equal to the all of the individual sums of resistors

Question 31

Give properties of parallel circuits

Answer 31

Components connected alongside each other. An electron won’t pass through every component of its way round. Current will split as it passes through one or other of the loops so ammeters are placed in different places. Potential differences equal to the potential differences cross the parallel components resistors are connected in parallel. The supply current is divided between this means the overall current is reduced due to having multiple paths

Question 32

In a series circuit, the resistance of the network is equal to the sum of two individual….

Answer 32

Resistances

Question 33

In parallel circuit, the resistance of the network is less than neither of the two….

Answer 33

Individual resistances

Question 34

What is power?

Answer 34

The amount of energy transferred each second between the energy stores

Question 35

What are the two equations for power?

Answer 35

Current times potential difference and current squared times resistance

Question 36

One watt equals one…. Per second

Answer 36

Joule

Question 37

How can electrical power be delivered?

Answer 37

With a low current and high voltage or a high current and low voltage

Question 38

What does transmitting energy at a high voltage and low current due to the wire?

Answer 38

It keeps it cool and wastes less energy