Lesson 1

Question 1

What is an Electric Charge?

Answer 1

It is a electrical property that is either positive (proton) or negative (electron)

Question 2

How is charge measured?

Answer 2

In Columbs

Question 3

What is a fundamental charge?

Answer 3

The electric charge possessed by a single proton, or an elecron.

Question 4

How much is 1 coloumb of charge in protons as one fundamental charge?

Answer 4

6.25x10^18=1.6x10^-19 C

Question 5

What is Electric Current

Answer 5

The rate of flow of charge

Question 6

Where does current flow

Answer 6

Current flows from the positive terminal to the negative terminal

Question 7

Where does electrons flow

Answer 7

Flows from the negative to positive terminal

Question 8

What is the SI unit of curret

Answer 8

Ampere (A)

Question 9

What is the formula of current

Answer 9

Current=Charge/Time
I=Q/T

Question 10

What is Electric Potential

Answer 10

The potential (or voltage) at a point with respect to a reference point (ground) in the electrical system.

Question 11

What is required for electric charges in a medium?

Answer 11

Voltage is required

Question 12

What is the Si units of voltage?

Answer 12

Volt (V)

Question 13

What is the formula of voltage?

Answer 13

Voltage=Work/Charge
V=W/Q

Question 14

What is potential difference?

Answer 14

The algebraic difference in a potential (or voltage difference between two points in a electrical circuit

Question 15

What is the SI unit for potential difference ( Difference in Voltage)

Answer 15

Volt (V)

Question 16

What is the Formula for Potential Difference

Answer 16

Difference in V=Current x Resistance
Change in V=IR

Question 17

What is Electromotive Force (EMF)

Answer 17

Primary source of electrical energy without internal resistance.
Examples: Batteries, dry cells, solar panels and generators

Question 18

What is the SI unit for EMF

Answer 18

Volt (V)

Question 19

What is the formula for EMF

Answer 19

𝐸𝑀𝐹=∆𝑉+𝐼𝑟 Volts –>Conservation of Energy

Question 20

What is Ground (GND)

Answer 20

A Ground (GND) is a reference point in an electrical circuit that serves as a safety and reference point for voltages.
Providing a path for excess current to safely dissipate into the earth, protecting against electrical faults.
The Ground (GND) is linked to the earth physically.

Question 21

What is the difference between GND and COM

Answer 21

it may not be connected to the earth directly. For example, a digital multimeter.

Question 22

What is Electric Resistance?

Answer 22

The opposition to the movement of electrical charges.

Question 23

What are the sources of Electric Resistance?

Answer 23

Sources: Insulators, resistors, and hot wires

Question 24

What is the SI unit for resistance?

Answer 24

S.I unit: Ohm (Ω)

Question 25

What is the formula for Resitance?

Answer 25

Formula: 𝑅=𝑉/𝐼 Ohms

Question 26

Another formula for resistance?

Answer 26

Alternatively, R can be expressed as 𝑅=𝜌𝑙/𝐴

Question 27

What is Electrical Energy?

Answer 27

The amount of energy used to move charged particles through a wire.

Question 28

What is the SI unit for electrical energy?

Answer 28

S.I unit: Joule (J)

Question 29

What is the formula for electrical energy?

Answer 29

Formula: 𝑊=𝑉𝑄 𝑜𝑟 𝑊=𝑉𝐼𝑡 Joules

Question 30

What is Electrical Power?

Answer 30

The rate of electrical energy transferred by an electric circuit.

Question 31

What is the SI unit for Electrical Power

Answer 31

SI unit Watt (W)

Question 32

What is the formula for Electrical Power

Answer 32

Formula: 𝑃=𝑊/𝑡 𝑜𝑟 𝑉𝑄/𝑡 𝑜𝑟 𝑉𝐼 𝑜𝑟 𝐼^2 𝑅 𝑜𝑟 𝑉^2/𝑅 Watts

Question 33

What is a Short Circuit?

Answer 33

A short circuit occurs when an electrical current flows through an unintended path with very little (or zero) resistance.

Question 34

What are the risks of a short circuit?

Answer 34

Often leads to excessive current flow, which can generate heat, damage components, pose safety risks or cause fires.

Question 34

When does a short circuit occur?

Answer 34

This usually happens when two points in a circuit that should not be directly connected come into contact (faulty wiring, damaged insulation, wrong connections etc.), allowing current to bypass the intended load.

Question 35

What is the formula for resistance in a series connection?

Answer 35

Total resistance, 𝑅_𝑠𝑢𝑚=𝑅_1+𝑅_2+𝑅_3

Question 36

What is the formula for resistance in a parallel connection?

Answer 36

Total resistance, 𝑅_𝑠𝑢𝑚 can be determined by 1/𝑅_𝑠𝑢𝑚 =1/𝑅_1 +1/𝑅_2 +1/𝑅_3

Question 37

Formula linking Voltage Energy and Charge

Answer 37

Energy=Voltage x Charge