Electricity

Question 1

In which direction does current flow in a circuit

Answer 1

From the positive to negative terminal

Question 2

in what way do electrons travel around a circuit

Answer 2

Negative to positive (electrons negatively charged)

Question 3

whats the relationship between current or resistance to temperature

Answer 3

If current or resistance increases, then temperature increases

Question 4

How are ammeters added to a circuit

Answer 4

In series

Question 5

how are voltmeters added to a circuit

Answer 5

they are added in parallel to the circuit

Question 6

How to figure out the potential difference in a series circuit

Answer 6

Vtotal=V1 + V2 + v3
the total potential difference is shared across the circuit

Question 7

What is the current in a series circuit?

Answer 7

The current is the same anywhere in a series circuit

Question 8

resistance in a series circuit ?

Answer 8

Total resistance is just the resistance of each component added together

Question 9

How is a voltmeter connected to a series circuit?

Answer 9

A voltmeter is always connected in parallel to a circuit no matter what kind of circuit it is

Question 10

what is a parallel circuit ?

Answer 10

a parallel circuit is where the circuit is split into branches

Question 11

How is potential difference shared in a parallel circuit ?

Answer 11

The potential difference in each component has the same potential difference equal to the battery
For example
If the circuit is powered by a 12V battery, each component will have the potential difference of 12 volts

Question 12

How is current shared in a parallel circuit ?

Answer 12

The total current in a circuit is shared out between each branch
For example
If the total current is 6Amps and there is 2 branches
the current could be shared out in 3A and 3A
or 1A and 5A

Question 13

Describe the resistance in a parallel circuit

Answer 13

An increase in components in branches will lead to a decrease in total resistance because more branches leads to an increase in pathways for the current to take
Also
The total resistance is LESS than the resistance of the smallest individual resistor

Question 14

A step up transformer ?

Answer 14

A step up transformer INCREASES the voltage but decreases the current because an increase in current increases the temperature and an increase in temperature causes energy to be lost

Question 15

A step down transformer?

Answer 15

DECREASES the voltage to not break appliances and it increases the current to 230V to be used in our homes

Question 16

Differences between alternating and direct current

Answer 16

ALTERNATING current has the current change direction at a certain frequency in Hz so the current and potential difference changes from positive to negative at 50Hz in the UK and this alternating current is used in the mains

In DIRECT current the direction of the current stays the same and it stays either positive or negative , this current is often used in battery powered devices such as batteries and

you can figure out what current it is using an osciloscope to form a potential difference time graph