REC Electrical Module Flashcards

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Questions and Answers

What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

What is the unit for voltage?

Volts

What is the unit for current?

Amps

What is the unit for resistance?

Ohms Signup and view all the answers

What is electricity?

Energy resulting from charged particles (electrons or protons). Signup and view all the answers

How is electricity formed?

Charge (statically) or current (dynamically). Signup and view all the answers

Static electricity is caused by _ _ charge by friction.

electric charge Signup and view all the answers

Current electricity is electrical charge that flows from one place to another through a _________.

conductor Signup and view all the answers

What is voltage?

Force that pushes the current through the circuit. Signup and view all the answers

What is voltage measured with?

Voltmeter Signup and view all the answers

What is potential difference (pd)?

Different cells produce different voltages. Signup and view all the answers

What is resistance?

Friction that slows down the flow of the current through the circuit. Signup and view all the answers

Current refers to the electrons that flow through the wires of the _________.

circuit Signup and view all the answers

In a series circuit, if one light goes out then the circuit is broken.

True Signup and view all the answers

What happens if there's a break in a series circuit?

The circuit is no longer complete and the current can't flow. Signup and view all the answers

What happens to Ohm's Law in a series circuit as more bulbs are added? (Select all that apply)

Voltage decreases Signup and view all the answers

What happens to Ohm's Law in a parallel circuit as more bulbs are added? (Select all that apply)

Resistance decreases Signup and view all the answers

Current in a series circuit ________ at all points in the circuit.

remains the same Signup and view all the answers

Current in a parallel circuit is ________ between the components.

shared Signup and view all the answers

What is current measured with?

Ammeter Signup and view all the answers

What is the definition of one Volt?

Joule per Coulomb (J/C) Signup and view all the answers

What is the definition of one Amp?

One coulomb per second (C/s) Signup and view all the answers

What is the definition of one Watt?

One joule per second (J/s) Signup and view all the answers

What is electrical power, expressed as a formula?

P=IV Signup and view all the answers

What is frequency?

The number of waves that pass a fixed place in a given amount of time. Signup and view all the answers

What is frequency measured in?

Hertz (Hz) Signup and view all the answers

What defines AM waves?

The amplitude, or overall strength, of the signal is varied to incorporate the sound information. Signup and view all the answers

What defines FM waves?

The frequency of the carrier signal is varied and it's not affected by frequency changes. Signup and view all the answers

What is digital?

On or off. Example: Limit switch, bumper switch, ultrasonic, optical shaft encoder. Signup and view all the answers

What is analog?

Range of values. Example: Light sensor, light follower, potentiometer. Signup and view all the answers

Study Notes

Ohm's Law

Fundamental principle relating voltage (V), current (I), and resistance (R) in an electrical circuit (V = IR).

Electrical Units

Voltage is measured in Volts.
Current is measured in Amps.
Resistance is measured in Ohms.

Electricity Basics

Electricity arises from charged particles, such as electrons and protons.
Exists as static electricity (stationary charge) or current electricity (flowing charge).

Static and Current Electricity

Static Electricity: Electricity generated by friction leading to charge accumulation; may cause sparks and attraction of small particles.
Current Electricity: Flow of electrical charge typically through a conductor.

Voltage and Measurement

Voltage is the force pushing current through a circuit.
Measured using a Voltmeter.
Potential difference varies across components and affects current; greater voltage results in higher current flow.

Resistance

Resistance is the friction opposing the flow of current in a circuit.
Measured as Ohms.

Circuit Types

Closed Circuit: Current circulates without break; electrons flow in the opposite direction of the conventional current flow.
Series Circuit: Components arranged in a single pathway; if one component fails, the entire circuit is disrupted.
Parallel Circuit: Components connected across multiple paths; maintains functionality even if one component fails.

Circuit Characteristics

In a series circuit:
- Voltage decreases with more bulbs added, current decreases, and resistance increases.
- Current remains the same at all points.
In a parallel circuit:
- Voltage remains the same across all components, current increases with added bulbs, and total resistance decreases.

Component Connections

In both series and parallel circuits, components have their ends connected; the setup influences circuit behavior.

Current Measurement

Current is measured using an Ammeter.

Power and Frequency

Electrical Power calculated using the formula P = IV.
Frequency refers to the number of cycles per unit time, measured in Hertz (Hz).

Wave Types

Alternating Current (AC): Charge reverses direction periodically.
Direct Current (DC): Charge flows consistently in one direction.

Units of Measure

One Volt equals one Joule per Coulomb (J/C).
One Amp equals one Coulomb per second (C/s).
One Watt equals one Joule per second (J/s).

AM vs FM

AM Waves: Vary in amplitude, incorporating sound information into signal strength.
FM Waves: Vary in frequency, providing improved sound quality less affected by environmental noise.

Digital vs. Analog

Digital: Represents values as distinct on/off states (e.g., limit switches).
Analog: Represents a continuum of values (e.g., light sensors).

Logic Gates

Basic components of digital circuits, serving various logical functions contributing to circuit behavior.

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Description

Explore key concepts and terminology related to electricity with these flashcards. Test your understanding of Ohm's Law, voltage, current, resistance, and other fundamental aspects of electrical theory. Perfect for students preparing for exams or anyone looking to brush up on their electrical knowledge.