Current is the rate of flow of electric charge, measured in amperes (A) .

State the relationship between the ampere and the coulomb .

One ampere is equivalent to a charge of one coulomb flowing in one second: 1 A = 1 C/s.

What instrument is used to measure current, and how must it be connected in a circuit?

Current is measured using an ammeter , connected in series with the component being measured.

Why are the wires in an electric circuit usually made of metal?

Metal is a good conductor of electric current, so the wires allow current to flow through the circuit easily.

In metal wires, the current is a flow of ______ charged electrons.

In metal wires, the current is a flow of negatively charged electrons.

True or False? Current flows from the positive terminal to the negative terminal of a cell when a circuit is formed.

True. Current flows from the positive terminal to the negative terminal of the cell whenever a circuit is formed.

Voltage is the energy transferred per unit charge passing between two points, measured in volts (V) .

State the relationship between the volt , the joule and the coulomb .

One volt is equivalent to the transfer of one joule of energy by one coulomb of charge: 1 V = 1 J/C.

What instrument is used to measure voltage, and how must it be connected in a circuit?

Voltage is measured using a voltmeter , connected in parallel with the component being measured.

As electrons flow through a cell, and then through the rest of the circuit, what happens to their energy?

Electrons gain energy as they pass through the cell, then lose energy as they flow through the wires and components in the rest of the circuit.

The terminals of a cell make one end of the circuit ______ and the other ______ .

The terminals of a cell make one end of the circuit positive and the other negative .

True or False? A voltmeter must be connected in series with the component being measured.

False. A voltmeter must be connected in parallel with the component being measured, not in series.

Resistance is the opposition of a component to the flow of electric current through it, measured in ohms (Ω) .

What does a resistance of 1 Ω correspond to, in terms of voltage and current?

A resistance of 1 Ω is equivalent to a voltage across a component of 1 V producing a current of 1 A through it.

For a fixed voltage across a component, how does resistance affect the current that flows?

The higher the resistance, the lower the current that can flow; the lower the resistance, the higher the current that can flow.

Why is copper commonly used to make wires in electrical circuits?

Copper has a low electrical resistance, making it a good conductor .

All electrical components, including wires, have some value of ______ .

All electrical components, including wires, have some value of resistance .

IGCSEPhysicsEdexcelPhysics (Modular)Unit 1Flashcards2. ElectricityCurrent, Potential Difference & Resistance

Current, Potential Difference & Resistance (Edexcel IGCSE Physics (Modular): Unit 1): Flashcards

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Cards in this collection (21)

Define current.
Current is the rate of flow of electric charge, measured in amperes (A).
State the relationship between the ampere and the coulomb.
One ampere is equivalent to a charge of one coulomb flowing in one second: 1 A = 1 C/s.
What instrument is used to measure current, and how must it be connected in a circuit?
Current is measured using an ammeter, connected in series with the component being measured.
Why are the wires in an electric circuit usually made of metal?
Metal is a good conductor of electric current, so the wires allow current to flow through the circuit easily.
In metal wires, the current is a flow of ______ charged electrons.
In metal wires, the current is a flow of negatively charged electrons.
True or False?
Current flows from the positive terminal to the negative terminal of a cell when a circuit is formed.
True.
Current flows from the positive terminal to the negative terminal of the cell whenever a circuit is formed.
What is the equation linking charge, current and time?
$Q = I \times t$
Where Q = charge (coulombs, C), I = current (amps, A), t = time (seconds, s).
Define voltage.
Voltage is the energy transferred per unit charge passing between two points, measured in volts (V).
State the relationship between the volt, the joule and the coulomb.
One volt is equivalent to the transfer of one joule of energy by one coulomb of charge: 1 V = 1 J/C.
What instrument is used to measure voltage, and how must it be connected in a circuit?
Voltage is measured using a voltmeter, connected in parallel with the component being measured.
As electrons flow through a cell, and then through the rest of the circuit, what happens to their energy?
Electrons gain energy as they pass through the cell, then lose energy as they flow through the wires and components in the rest of the circuit.
The terminals of a cell make one end of the circuit ______ and the other ______.
The terminals of a cell make one end of the circuit positive and the other negative.
True or False?
A voltmeter must be connected in series with the component being measured.
False.
A voltmeter must be connected in parallel with the component being measured, not in series.
What is the equation linking energy transferred, charge and voltage?
$E = Q \times V$
Where E = energy transferred (joules, J), Q = charge moved (coulombs, C), V = voltage (volts, V).
Define resistance.
Resistance is the opposition of a component to the flow of electric current through it, measured in ohms (Ω).
What does a resistance of 1 Ω correspond to, in terms of voltage and current?
A resistance of 1 Ω is equivalent to a voltage across a component of 1 V producing a current of 1 A through it.
For a fixed voltage across a component, how does resistance affect the current that flows?
The higher the resistance, the lower the current that can flow; the lower the resistance, the higher the current that can flow.
Why is copper commonly used to make wires in electrical circuits?
Copper has a low electrical resistance, making it a good conductor.
All electrical components, including wires, have some value of ______.
All electrical components, including wires, have some value of resistance.
True or False?
A resistance of 2 Ω would produce a current of 2 A when a voltage of 1 V is applied across it.
False.
Using $V = I \times R$ , a voltage of 1 V across a resistance of 2 Ω gives a current of 0.5 A, not 2 A.
State the equation linking voltage, current and resistance.
$V = I \times R$
Where V = voltage (volts, V), I = current (amps, A), R = resistance (ohms, Ω).

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