Electronics: How Electricity Works

Question 1

The 2 requirements for Electricity to flow

Answer 1

Needs a Path and a Push

Question 2

What is a circuit?

Answer 2

a circuit is any arrangement that allows for electrical current to flow. An

Question 3

Load

Answer 3

The device powered by a circuit

Question 4

What does a basic circuit consist out of?

Answer 4

basic circuit consists of a power supply (the battery), a load (the lamp), and the wire.

Question 5

What is Voltage?

Answer 5

It is the Electromotive Force (emf) or “push” that gets electrons jumping from one atom to another, creating a flow of current

Question 6

Which sources can generate an emf?

Answer 6

Chemical reactions
Electromagnetic generators
Photovoltaic cells
Generators
Friction
Thrmoelectrial sources

Question 7

What is induction?

Answer 7

Generating a current by rotating a conductive metal in a magnetic field.

eg.) an generator that converst mechanical energy to electrical energy

Question 8

How do generators work?

Answer 8

They use turbines to generate a current through the process of induction, converting mechanical energy into electical energy

Question 9

What are some ways to turn the turbines of generators

Answer 9

water
Steam (Coal, Atomic)
Wind

Question 10

Who discovered the principle of induction?

Answer 10

Micheal Farraday

Question 11

What does voltage measure?

Answer 11

The force required to move electricity between two points on a circuit, or the potential difference between those two points

Question 12

Can voltage be measured at a single point?

Answer 12

No, It is always measured across two points as it is a measure of the potential difference between two points

Question 13

What is Current?

Answer 13

Current is a measure of the electrons moving through a circuit?

Question 14

What is a Coulomb?

Answer 14

a set unit of electrons: 6.25 x 10( to the power of 18)

Question 15

what is an Ampere?

Answer 15

a coulomb of current that moves through a point in one second

Question 16

What is resistance?

Answer 16

The oppositional force to emf

Question 17

Why is voltage measured across two points?

Answer 17

As current is pushed through a circuit by voltage, it encounters resistance, which reduces the voltage. This is why we measure voltage across different points along the circuit.

Question 18

What is an Ohm?

Answer 18

An ohm is the level of resistance that allows the one volt of emf to move one ampere across two points on a circuit.

Question 19

Ohm’s Law

Answer 19

Law. Ohm’s Law states that the current (I) between two points is directly proportional to the voltage (V) and inversely proportional to the resistance (R). As an equation, it is written I = V/R.

Question 20

What is Power?

Answer 20

power is voltage multiplied by current. The unit of measurement for power is the watt (W),

Question 21

1 Watt

Answer 21

One volt pushing one amp of current equals one watt.

Question 22

Joule’s Law

Answer 22

Power = Voltage × Current or P = V x I

Question 23

3 Formulas for Power

Answer 23

V x I
V sqaured/R
I squared x R

Question 24

3 Formulas for Current

Answer 24

V/R
P/V
Square root of P/R

Question 25

3 Formulas for Resistance

Answer 25

V squared/P
V/I
P/I sqaured

Question 26

3 Formulas for Voltage

Answer 26

I X R
Root square of P X R
P/I