Physics electrical circuits

Question 1

Current

Answer 1

A flow of electricity

Question 2

Voltage

Answer 2

An electrical push

Question 3

Resistance

Answer 3

The opposition to the flow of electricity

Question 4

Amp

Answer 4

Unit of current

Question 5

Volt

Answer 5

Unit of voltage

Question 6

Ohm

Answer 6

Unit of resistance

Question 7

Conductor

Answer 7

A material the allows electricity to flow easily

Question 8

Insulator

Answer 8

A material that does not allow electricity to flow easily

Question 9

Resistor

Answer 9

An electrical object that has resistance

Question 10

Variable resistor

Answer 10

An electrical device whose resistance we can easily change

Question 11

Series circuit

Answer 11

A circuit where there is only one path for the electricity to flow

Question 12

Parallel circuit

Answer 12

A circuit where there are more than one path for the electricity to flow

Question 13

Ammeter

Answer 13

Electrical meter that measures the current flow

Question 14

Voltmeter

Answer 14

Electrical meter that measures the voltage push

Question 15

Diode

Answer 15

An electrical device that only allows current to flow in one direction through it

Question 16

Light emitting diode (LED)

Answer 16

An electrical device that gives out light and only allows current to flow in one direction through it

Question 17

Light dependant resistor (LDR)

Answer 17

An electrical device whose resistance decreases when more light falls on it

Question 18

Thermistor

Answer 18

An electrical device whose resistance decreases when it heats up

Question 19

Power

Answer 19

The energy transferred each second

Question 20

Watt

Answer 20

Unit of power (1 joule per second)

Question 21

An ammeter is..

Answer 21

always put into the circuit in series

Question 22

How do bulbs change the current of electricity

Answer 22

more bulbs = lower current (inverse)

Question 23

What is special about the current in a series circuit

Answer 23

The current always stays the same at any point of a series circuit

Question 24

Do bulbs use any current

Answer 24

No current is used by the bulb, changing the number of bulbs changes the current

Question 25

What happens to the current in a parallel

Answer 25

Current can split up in a parallel circuit depending on the number of bulbs in each branch of the circuit. The total current must remain the same.

Question 26

A voltmeter is always...

Answer 26

parallel across a component

Question 27

How does voltage change in a series circuit

Answer 27

The voltage should always be equal when added up and compared to the voltage of the cell

Question 28

How does the voltage change in a parallel circuit

Answer 28

The voltage in a parallel circuit is the same across all components

Question 29

The size of the current flowing in a circuit is determined by...

Answer 29

The number of cells and the resistance of the circuit

Question 30

The same current flows...

Answer 30

Through all parts of a series circuit

Question 31

The total resistance of a circuit is...

Answer 31

Sum of all the resistance of the components

Question 32

Resistance can be thought of...

Answer 32

the opposition to the flow of current in a circuit

Question 33

Resistance equation

Answer 33

Resistance = voltage (volts) over current (amps)

Question 34

Ohm's law equation

Answer 34

V = I x R Voltage = Current x Resistance

Question 35

Current equation

Answer 35

Current = voltage over resistance

Question 36

Whenever there are resistors in series the total resistance is the sum of...

Answer 36

all the resistors

Question 37

negative temperature coefficient (NTC) at low temperature

Answer 37

When the temperature is low the resistance of the thermistor is high. The voltmeter reading is high

Question 38

negative temperature coefficient (NTC) at high temperature

Answer 38

When the temperature is high the resistance of the thermistor is low. The voltmeter reading is low.

Question 39

Light dependant resistor (LDR) at night

Answer 39

In the dark the LDR's resistance is high so it will have more voltage across it. The reading of the voltmeter is high

Question 40

Light dependant resistor (LDR) at day

Answer 40

In the day it's resistance falls so less voltage is across it. The reading on the voltmeter is low.

Question 41

Power equation

Answer 41

Power = Energy over time Power = Voltage x current Power = current squared x resistance