Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics Gr.10 > Electics Circuits (no internal resistance > Flashcards

Electics Circuits (no internal resistance Flashcards

(50 cards)

Start Studying
1
Q

Define Potential Difference

A

The energy transferred per unit electric charge flowing through it

V = W/Q

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Potential difference measure in…

A

Volts (V)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define emf (electro motor force)

A

The maximum energy provided by a cell/ battery per unit charge passing through it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

EMF is equal to..

A

Potential difference measured across the terminals of a battery when no charges are flowing in the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define:
Terminal potential difference

A

The voltage measured across the terminals of a battery when charges are flowing in a circuit
( voltmeter)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define Current (strength)

A

The rate of flow of charge
(Ammeter)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Series circuit

A

1 pathway for current to flow
(1 loop)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Parallel circuit

A

More than 1 possible pathway for current to flow (branches)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Equation for :
*potential difference (v)
*energy transferred (work done) (w)
*charge (Q)

A

V = W/Q

V = voltage, potential difference, volts : V)
W= Joules (J)
Q= charge : Coulombs (C)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The charge that an object carries is measured in:

A

Coulombs (C)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

One coulomb of charge represents:

A

Total amount of charge that 6.25 x 10^18 electrons will have

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define coulomb:

A

Energy transferred by large packets of electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The unit of potential difference (V(ext) / emf =

A

Volts / joules per coulomb (J.C^-1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why do voltmeters need to be connected in parallel?

A

It needs to measure the potential difference across a component

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Internal resistance:

A

Energy is lost when charges move through the cell or battery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Internal resistance of cell/ battery is zero

A

No energy is dissipated per unit of charge/ per coulomb.
*the emf and terminal potential difference with therefore have same value)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Resistance of wires are negligible:

A

No energy is disappeared as charges move through the wires in the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Define a coulomb

A

The amount of charge which passes a point in a conductor in one second when the strength of the current is 1 ampere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Current (I) =

A

Ampere (A) / coulombs per second (c.s^-1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What does an ammeter measure?

A

The number of coulombs that pass by a certain point each second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Why do Ammeters need to be connected in series?

Study These Flashcards
A

In order to measure the current AT A POINT that goes THROUGH a particular component

22
Q

Equation for current, charge and time:

Study These Flashcards
A

I = Q/ Δt

I = current : ampere (A)
Q = charge : coulombs (C)
Δt = time : seconds (s)

23
Q

Define resistance:

Study These Flashcards
A

The Ratio of the potential difference across a resistor to the current in the resistor.

24
Q

What does resistance oppose?

Study These Flashcards
A

The flow of electric charges

25
Define the unit of resistance:
One ohm (Ω) is equal to one volt per ampere
26
Microscopic description of resistance:
Resistance is caused by the energy lost as electrons scatter due to collisions with the atoms of the conductor, converting some of their kinetic energy into heat.
27
Factors that affect the resistance of a given material:
Temperature Length Thickness
28
As the temperature increases , the resistance increases
As the temperature increases, the atoms in a conductor vibrate more, leading to more collisions with electrons. These collisions hinder the flow of electrons causing resistance to increase)
29
As the length increases , the resistance increases
Electrons have to travel a greater distance, leading to more collisions with atoms along the way. More collisions mean more energy loss, resulting in higher resistance
30
As the thickness (width of the wire) increases , the resistance decreases
A wider wire provides more space for electrons to flow. This reduces the likelihood of collisions with atoms, allowing current to pass more easily, which lowers the resistance Nature of wire (metal density)
31
At a constant temperature:
The potential difference across a conductor is DIRECTLY PROPORTIONAL to the current through that conductor
32
Equation for: current, potential difference and resistance
R = V/ I R = resistance : ohms (Ω) V = potential difference : volts (V) I = current : (amperes) (A)
33
Resistance is measured in ohm Ohm can also be described as
Volts per ampere (V.A^_1)
34
Why does a battery in a circuit eventually go flat?
Charges drain energy as they move through cells/ batteries. This energy is delivered to the components in the circuit where it is converted into different forms of energy. Eventually the energy of the cell/ battery gets depleted. = unable to pass electrons through
35
State Ohm’s law:
The potential difference across a conductor is directly proportional to the current in the conductor at constant temperature.
36
Energy equation
W = V^2/ R (Δt)
37
Define Power
The rate at which work is done The rate at which energy is transferred
38
Equation for Power
P = V^2/ R Δt
39
Define Power
The rate at which work is done or the rate at which energy is transferred
40
Power equation
P = W/ Δt
41
Energy (w) is measured in
Joules (J)
42
Power (P) is measured in
Watts (W) Joules per second (J.S^-1)
43
Resistors in series circuit
The current is the same through each resistor
44
Calculate the equivalent (total) resistance of resistors connected in series:
R(s) /(ext) = R(1) + R(2) +…..
45
A series circuit is a potential difference DIVIDER
The total potential difference is equal to the sum of the potential differences across all the individual components that are connected in series.
46
Equation for : Sum of potential difference
V (ext / s) = V(1) + V(2) + ….
47
Resistance in parallel
The potential difference is the same across parallel branches.
48
Total resistance of resistors in parallel EQUATION
1/ R(p) = 1/ R (branch 1) + 1 / R(branch 2) … R(branch 1) : total resistance of all resistors in branch 1 R(branch 2) : total resistance of all resistors in branch 2
49
Parallel circuits are current dividers:
Total current in the circuit is equal to the sum of the branch circuits
50
Calculate the equivalent/ effective external resistance of a combined circuit (series & parallel connections)
Calculate R(p) first Then- R(ext) by adding the series resistors R(ext) = R(p) + R(s)

Physics Gr.10 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions