Flashcard on Basic Electricity Concepts

Front

What type of charge does an electron have?

Back

Negative

Answer explanation

An electron carries a negative charge, which is fundamental to its nature. This distinguishes it from protons, which have a positive charge, and neutrons, which are neutral.

Front

What part of an atom freely moves from one atom to another in a good conductor?

Back

Electron

Answer explanation

In a good conductor, electrons are the particles that can move freely between atoms. This mobility allows for the conduction of electricity, unlike protons and neutrons, which are fixed in the nucleus.

Front

Typical insulators are...

Back

Glass, plastic, and rubber

Answer explanation

Typical insulators are materials that resist the flow of electricity. Glass and rubber are well-known insulators, while copper, silver, iron, steel, aluminum, and gold are conductors, making them unsuitable as insulators.

Front

Electricity can be produced from...

Back

magnetism, chemicals, and heat

Answer explanation

Electricity can be generated through various methods: chemical reactions (like batteries), magnetic fields (like generators), and heat (like thermoelectric generators). Therefore, the correct answer is 'All of the above'.

Front

The unit of measurement for resistance is...

Back

Ohm

Answer explanation

The unit of measurement for resistance is the Ohm, which quantifies how much a material opposes the flow of electric current. Ampere measures current, Volt measures voltage, and Watt measures power.

Front

An ampere is...

Back

A unit of current; the measure of the electrons flowing past a point in a specific period of time.

Answer explanation

An ampere is defined as a unit of electric current, which measures the flow of electric charge. Therefore, the correct answer is 'A unit of current'.

Front

Switches in electrical circuits are usually wired...

Back

In series with the load

Answer explanation

Switches are typically wired in series with the load to control the flow of electricity. This allows the switch to open or close the circuit, turning the load on or off effectively.

Front

How are loads or power-consuming devices usually wired?

Back

In parallel with the power source

Answer explanation

Loads or power-consuming devices are typically wired in parallel with the power source to ensure they receive the same voltage and can operate independently. This allows multiple devices to function simultaneously.

Front

Back

Answer explanation

Using Ohm's Law (V = I × R), we can rearrange to find resistance (R = V/I). Substituting the values, R = 120V / 6A = 20Ω. Therefore, the resistance is 20Ω.

Front

Back

Answer explanation

Using Ohm's Law, V = I * R, we can rearrange to find I = V / R. Substituting the values, I = 120V / 30Ω = 4A. Therefore, the current is 4A.