Resistor, Resistance, and Electric Quantities

This set of flashcards covers essential terms and concepts related to resistors, resistance, and electric quantities important for understanding electrical circuits.

Resistor

An electronics component that provides a specified amount of opposition (resistance) to the flow of current.

Resistance

The opposition to the flow of electrons or current, measured in Ohms.

Ohm's Law

A fundamental principle stating that the voltage across a conductor is directly proportional to the current flowing through it, V = I.R.

Current (I)

The continuous movement of electrons through a conductor, measured in Amperes (A).

Voltage (V)

The measure of electrical potential energy per unit charge, driving electric current through a conductor.

Electric Charge (Q)

An intrinsic property of matter that establishes a force of attraction or repulsion; measured in Coulombs (C).

Direct Current (DC)

Electric current that flows in only one direction.

Alternating Current (AC)

Electric current whose magnitude changes continuously and direction changes periodically.

Power (P)

The amount of electric energy converted to another form of energy in a given length of time, measured in Watts (W).

Electric Power Equation

Power is calculated as P = Voltage x Current.

What is resistance measured in?

Resistance is measured in Ohms.

What instrument measures voltage?

A Voltmeter is used to measure voltage or potential energy difference.

What is Ohm's Law formula?

Ohm's Law is expressed as V = I.R.

What does an Ammeter measure?

An Ammeter is an instrument used to measure current flow in a circuit.

What is a fixed resistor?

A resistor that provides a constant resistance value.

What is a variable resistor?

A resistor whose resistance can be adjusted.

What do series circuits do with resistance when more components are added?

Adding components in series increases total resistance.

What do parallel circuits do with resistance when more components are added?

Adding components in parallel decreases total resistance.

Electric Potential Energy

is the work equivalent to the amount of energy put into the field of the interaction.

Capacitance

is the measure of the ability of two conductors to store charge when a given potential difference is established between them

Capacitor

an electrical device with two insulated plates arrange in parallel and place closely together with empty space between them that stores electrical energy upon charging by a battery of the electrical field.

potential difference or voltage

is applied across a capacitor, charge is transferred making one plate positive and the other negative.

proportionally increased

if the potential between the plates is increased,the charge stored on each of the capacitor plates is