Current, Voltage and Resistance Flashcards

Questions and Answers

What is the symbol for electrical charge?

What is the unit of measurement of charge and its symbol?

Coulomb, C

What is the number of electrons for one unit of charge?

6.28 * 10^18 electrons

Describe static electricity.

Static electricity is the build-up of charge on an insulated object. Signup and view all the answers

Define electrical current.

An electric current is a flow of electrons from a negatively charged point to a positively charged point. Signup and view all the answers

What is the symbol for electric current?

I Signup and view all the answers

Write an equation to state the relationship between current, charge and time.

I = Q/t Signup and view all the answers

What is the unit of measurement for electric current and its symbol?

Ampere, A Signup and view all the answers

Describe conventional current flow.

Conventional current flow is from positive to negative and is opposite to electron flow. Signup and view all the answers

Define voltage.

Voltage is an imbalance of electron charges between two points. Signup and view all the answers

What is the name of the force that maintains a voltage?

Electromotive force Signup and view all the answers

State the abbreviation for this force.

emf Signup and view all the answers

State the unit of measurement for voltage and its symbol.

Volt, V Signup and view all the answers

State the symbols used to represent source voltage.

E Signup and view all the answers

State the symbols used to represent voltage drop.

V with subscript Signup and view all the answers

List six methods of producing an electromotive force.

<ol> <li>Magnetic: Ex. generator. 2. Chemical: Ex. battery. 3. Friction: Ex. Van de Graaf generator. 4. Heat: Ex. thermocouple. 5. Light: Ex. solar cells. 6. Pressure: Ex. piezo crystal.</li> </ol> Signup and view all the answers

Define resistance.

Resistance is the property of a material that opposes the flow of an electric current. Signup and view all the answers

State the unit of measurement for resistance and its symbol.

Ohms, Ω Signup and view all the answers

State Ohm's law in the form of an equation.

I = E/R Signup and view all the answers

How is Ohm's law stated?

The current is directly proportional to the emf and the current is inversely proportional to the resistance. Signup and view all the answers

Define one volt in terms of Ohm's law.

One volt is the value of the difference in charge that will cause a current of one ampere to flow in a circuit with a resistance of one ohm. Signup and view all the answers

Define electric circuit.

The connection of the source of emf to both ends of a conductor. Signup and view all the answers

Define voltage rise.

The source or applied voltage (emf). Signup and view all the answers

Define voltage drop.

The difference in charge measured across the load. Signup and view all the answers

Study Notes

Electrical Charge and Current

The symbol for electrical charge is Q.
Charge is measured in coulombs (C).
One unit of charge corresponds to approximately 6.28 x 10^18 electrons.

Static Electricity and Current

Static electricity refers to the accumulation of charge on an insulated object.
Electric current is defined as the flow of electrons from a negatively charged point to a positively charged point.
The symbol for electric current is I.
The relationship between current (I), charge (Q), and time (t) is expressed as I = Q/t.

Voltage and Electromotive Force

Voltage indicates an imbalance of electron charges between two points.
The force maintaining voltage is called electromotive force (emf), abbreviated as emf.
Voltage is measured in volts (V).

Voltage Representation

Source voltage is represented by the symbol E.
Voltage drop is denoted by V with a subscript.

Methods of Producing EMF

Electromotive force can be produced through several means:
- Magnetic: e.g., generator
- Chemical: e.g., battery
- Friction: e.g., Van de Graaf generator
- Heat: e.g., thermocouple
- Light: e.g., solar cells
- Pressure: e.g., piezo crystal

Resistance and Ohm's Law

Resistance is a property of materials that opposes electric current flow.
Resistance is measured in ohms (Ω).
Ohm’s Law is expressed as I = E/R, indicating that current (I) is directly proportional to emf (E) and inversely proportional to resistance (R).

Understanding Voltage

One volt is the potential difference required to cause a current of one ampere to flow through a resistance of one ohm.
An electric circuit is formed when a source of emf is connected to the ends of a conductor.
Voltage rise refers to the source or applied voltage (emf).
Voltage drop is the difference in charge observed across the load.

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Description

Test your knowledge of electrical principles with these flashcards focused on current, voltage, and resistance. Each card presents a key concept or term related to electricity, aiding in your understanding of fundamental concepts in physics. Perfect for students looking to solidify their grasp of electrical charge and its units.