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Phys > Chapter 4 -Electricity > Flashcards

Chapter 4 -Electricity Flashcards

1
Q

do like charges attract or repel?

A

repel

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2
Q

Resistance equation(involving current and potential difference)

A

Resistance= potential difference/current
R=V/I

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3
Q

How does current behave in a series circuit?

A

It stays the same

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4
Q

How does the PD behave in a series circuit?

A

Pd across components add up to pd across supply

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5
Q

how does current behave in parallel circuits?

A

The current in branches add up to the current in the supply.

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6
Q

How does PD behave in a parallel circuit?

A

The PD across the supply is the same as the PD across each branch.

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7
Q

what is PD?

A

a measure of the energy given to the charge carriers in a circuit
(basically energy from the supply)

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8
Q

What is electric current?

A

The flow of charge
or(Moving electric charges, eg electrons moving through a metal wire.)

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9
Q

List the I-v Characteristics of a filament bulb

A

•As current increases so does resistance
•This means less current can flow per unit PD.
•Therefore I-V graph gets shallower

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10
Q

What is electricity?

A

The flow of electrons along a wire.

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11
Q

Current Equation( involving time and charge)

A

Current =charge/ time

I=Q/t

I= Current(Amps, A)
Q= Charge( Coulombs, C)
t=time(in seconds, S)

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12
Q

What is Static Electricity?

A

An electric Charge that builds up on the surface of an insulator.
Example: A plastic comb

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13
Q

List an ohmic Conductors I-V characteristics

A

•The current and PD are directly proportional given there is no change in heat
•Constant
•The I-V graph has a straight line

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14
Q

True of false? All components in series will have the same size current flowing through them

A

True

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15
Q

How do you work out the total resistance of a series circuit?

A

By adding up the resistance of each component in the circuit

or
R=V/I

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16
Q

do ammeters need to be connected in series or parallel?

A

series

17
Q

do voltmeters need to be connected in series or parallel?

A

Parellel

18
Q

What two things affect the size of a current?

A

•Resistance
•Potential Difference

19
Q

If resistance increases what happens to the current?

A

It decreases(because less current can flow per second)

20
Q

If the potential difference is increased what happens to the current?

A

It increases

21
Q

the longer the wire the…….. the resistance

A

Higher

22
Q

What is Power

A

Power

Power (P) is the rate of energy transfer to a component.

23
Q

what happens if you rub a polythene rod with a dry cloth?

A

The electrons from the dry cloth are transferred to the rod making the rod negatively charged

24
Q

What happens if a Perspex rod is rubbed with a dry cloth?

A

The Perspex rod transfers electrons from the rod to the cloth making the cloth negatively charged and the rod positively charged.

25
Q

List the I-V characteristics of a diode

A

•It only lets current flow in one direction
•High resistance in reverse direction hence no reading on negative side of the graph

26
Q

true or false further away from field force becomes weaker

A

true

27
Q

true or false closer to fields force gets stronger

A

true

28
Q

what is an LDR and how does it works?(5 marks)

A

•Light Dependent Resistor
•Its a resistor dependent on light intensity
•Bright light= resistance falls
•darkness=resistance increases
•used for automatic lights in the evening and burglar alarms

29
Q

What is a thermistor and how does it work?

A

•temp dependent resistor
•hot= resistance drops
•cold=high resistance
•Useful temp detectors

30
Q

potential difference, energy transferred, charge equation

A

pd= energy transfered (J)/ Charge(Q) 9couloumbs,C,)

31
Q

what is the national grid

A

a giant system of cables and transformers

32
Q

What is static electricity

A

The build up of electric charge that builds up on the surface of an insulator such as a comb
Friction can be used to create a static charge

33
Q

Which subatomic particles move to conduct heat or electricity

A

Electrons

Phys (13 decks)

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