Current Electricity I

Question 1

voltage =

Answer 1

the amount of energy transferred per coulomb of charge

Question 2

1 volt is …

Answer 2

1 joule of charge

Question 3

voltage =

Answer 3

energy / charge

Question 4

current =

Answer 4

the rate of flow of charge

Question 5

what can be used to indicate the presence of current in a circuit?

Answer 5

lamps and LEDs

Question 6

the effect of changing the resistance on the current in a circuit …

Answer 6

increasing the resistance will decrease the current. This can be achieved by adding more components or components with a higher resistance. The reverse can be done to decrease the resistance

Question 7

How to LDRs work :

Answer 7

resistance changes with intensity of light. The brighter the light, the less resistance. The dimmer the light, the more resistance.

Question 8

How do thermistors work:

Answer 8

resistance changes with temperature. In hot conditions there is less resistance. In cold conditions there is more resistance

Question 9

Q stands for

Answer 9

charge

Question 10

I stands for

Answer 10

current

Question 11

T stands for

Answer 11

time

Question 12

current =

Answer 12

`charge / time

Question 13

potential difference =

Answer 13

amount of work done (energy transferred) per unit charge

Question 14

Current in series circuits depend on …

Answer 14

the applied voltage and the number and nature of other components

Question 15

In a series circuit …

Answer 15

everything is connected in one line. This means the voltage is shared out between each component; this makes it useful for supplying low power things like fairy lights

Question 16

In a parallel circuit …

Answer 16

different components are connected separately to the supply. This means that if one component breaks down the others can be powered as the whole circuit is still functioning. Is is also good for charging higher power things as the potential difference is equal all over a parallel circuit so each component receives the full voltage.