physics- electricity

Question 1

what charge does an electron has

Answer 1

. One electron has a charge of 1.6x10-19 C.

Question 2

what is charge measured in

Answer 2

Charge (Q) is measured in Coulombs (C)

Question 3

what is 1 coulomb defined as

Answer 3

1 Coulomb is defined as the amount of charge that passes in 1 second when the current is 1 Ampere

Question 4

what does a current of 1a mean

Answer 4

A current of 1A means that

1 coulomb of charge flows past that point every second

Question 5

what is current

Answer 5

Current (I) is the rate of flow of charge, and is measured in Amperes (A).

Question 6

what is potential difference measured in

Answer 6

voltages

Question 7

what does 1 voltage mean

Answer 7

1V

means that 1 Joule of work is done in pushing 1 coulomb of charge through a particular area/component

Question 8

where are voltmeters placed in a circuit

Answer 8

Voltmeters are placed in parallel and have infinite resistance, so they measure current between
2 points in a circuit.

Question 9

what is resistant defined as

Answer 9

the ratio of voltage to

current

Question 10

power

Answer 10

Power (P) is measured in watts (W)

Question 11

watts

Answer 11

the rate of transfer of energy.

1W is the transfer of 1 Joule of energy per second.

Question 12

what happens when cells are connected

Answer 12

When cells are connected in series, the total voltage supplied to the circuit is the sum of the individual voltages of the cells. However, when
identical cells are in parallel with each other, the total voltage supplied
to the circuit is equal to the voltage of just one of the cells

Question 13

what is a cell

Answer 13

A cell is a single electrical energy source which uses chemical reactions to produce a current*

Question 14

how to work out total voltage in a line

Answer 14

add them all together

Question 15

resistance in series circuit

Answer 15

add them

Question 16

resistance in parrellel

Answer 16

1/r and add .

Question 17

CONSERVATION OF CHARGE –

Answer 17

“The total charge flowing into a junction of wires must equal the total
charge flowing out of the wires”.
This leads to…

Question 18

KIRCHOFF’S FIRST LAW

Answer 18

– “The sum of the currents flowing into a junction of wires must equal the sum
of the currents flowing away from the junction of wires”.

Question 19

what happens with currents in parrelel and currents in series

Answer 19

In a parallel circuit, the current splits. In a series circuit, the current is constant throughout

Question 20

what is the conventional current

Answer 20

The arrow points in the direction of
conventional current, which flows from positive to negative.
Although electrons themselves flow from negative to positive,

Question 21

why is the conventional current the opposite way around

Answer 21

the convention was decided years before this was discovered,
so when discussing currents, we say that current flows from
positive to negative (The tall end of the cell is the positive
end).

Question 22

why is the conventional current the opposite way around

Answer 22

the convention was decided years before this was discovered,
so when discussing currents, we say that current flows from positive to negative (The tall end of the cell is the positive end).

Question 23

voltage

Answer 23

shared in series circuits

same in parrellel circuit

Question 24

R1 V1

R2 V2

Answer 24

The ratio of the voltages is the same as the ratio of

the resistances.

Question 25

what is a diode

Answer 25

if a diode points in the direction of the conventional current nothing occurs. if it is in the opposite direction then it is in the reverse bias and no charge can go through

Question 26

Transformers

Answer 26

A transformer is a device that changes voltage and current, whilst keeping power the same.