Electrical circuits

Question 1

WHat symbol is I

Answer 1

Current

Question 2

what is Current a measure of

Answer 2

The flow of electrons around the circuit

Question 3

What is current measured by?

Answer 3

Amperes (amps)

Question 4

What symbol is V

Answer 4

Potential difference

Question 5

What is potential difference

Answer 5

The force driving the flow of electrons provided by cell

Question 6

What is PD measured in?

Answer 6

Voltage (volts)

Question 7

What symbol is R

Answer 7

Resistance

Question 8

What is resistance?

Answer 8

Everything that resists or opposes the flow of electrons

Question 9

What is resistance measured in?

Answer 9

Ohms

Question 10

If we increase the temp what will happen to the resistor?

Answer 10

also increases

Question 11

filament lamp graph reading

Answer 11

• current increases = temp increase
• causes the resistance to increase
• so less current flows per unit pd

Question 12

Diode graph reading

Answer 12

• current flows in one direction
• has very high resistance in reverse
  direction

Question 13

Fixed resistor graph

Answer 13

• Current is directly proportional to pd

Question 14

Why does the resistance increase when the temp does?

Answer 14

All of the ions in the metal vibrate faster making it harder for electrons to pass along the wire

Question 15

What is charge a measure of

Answer 15

The total current that flowed within a certain period of time

Question 16

What is charge measured in?

Answer 16

Coulombs (C)

Question 17

What are fuses used for?q

Answer 17

Break the circuit if too much current

Question 18

What could LDR (light depedant resistors) be used for?

Answer 18

• automatic night-lights
• burglar alarms

Question 19

What could thermistor be used for?

Answer 19

• Care engine
• electronic thermostats

Question 20

What is a downside of a series circuit?

Answer 20

if any of the component in the circuit is removed or disconnected, the circuit breaks and stops

Question 21

potential difference in a series circuit

Answer 21

PD is shared across all the components

Question 22

current in a series circuit

Answer 22

same everywhere in the circuit

Question 23

ohms law

Answer 23

components with a greater resistance, will always have a higher share of the voltage

Question 24

series circuit

Answer 24

Only has a single loop

Question 25

Parallel circuit

Answer 25

Has more than one loop

Question 26

pD in parallel circuit

Answer 26

the same across all components

Question 27

current in parallel circuit

Answer 27

Shared across all components

Question 28

resistance in parallel circuit

Answer 28

Loops with a greater resistance has a lower share of the current