AC/DC
Unit 15 Electrical Circuit and their Application
2021/2022
Unit 15 assignment B
,Table of Contents
Section 1................................................................................................................................................2
HOW ARE THEY PRODUCED?.............................................................................................................3
AC and DC generator.....................................................................................................................3
Electrical motor..............................................................................................................................4
HOW IS DC ELECTRICITY KEPT?..........................................................................................................5
Root mean square (RMS)...............................................................................................................5
Section 2................................................................................................................................................6
DEFIBRILLATOR..................................................................................................................................8
Section 3................................................................................................................................................9
National grid......................................................................................................................................9
HYDROPOWER PLANT......................................................................................................................10
LOW VOLTAGE VERSUS HIGH VOLTAGE GENERATOR..................................................................11
Transformers...................................................................................................................................12
Section 4..............................................................................................................................................13
RESIDUAL CURRENT CIRCUIT BREAKERS VS. EARTH LEAKAGE CIRCUIT BREAKERS (RCCB)..............13
In the context of kettles and hair dryers, what does "double insulated" mean?.........................15
What are fuses and how do they operate in home appliances?..................................................15
RETIFICATION...................................................................................................................................15
What are the dangers and built-in protections?..........................................................................17
Section 5..............................................................................................................................................18
THE ELECTRICITY AT WORK REGULATIONS 1989.............................................................................18
REGULATION:...............................................................................................................................18
Bibliography.........................................................................................................................................19
1
, Section 1
Alternating current Direct current
In the city, it is safer to
Before it loses energy,
The amount of energy carry over longer
DC voltage can only
that can be carried distances and can
travel so far.
supply more electricity.
The cause of the Magnetism that remains
Along the wire, there is a
direction of flow of constant throughout the
rotating magnet.
electrons wire
Frequency 50-60 Hz 0
While passing through a
In the circuit, it only
Direction circuit, it reverses its
flows in one way.
direction.
It's the magnitude of a
It's a constant-
Current current that changes
magnitude current.
throughout time.
Electrons are constantly Electrons always travel
Flow of electrons
swapping directions. in the same direction.
Obtained from AC generator Cells
Passive parameters Impedance Resistance only
Power factor Goes between 0 and 1 Always 1
Trapezoidal, square,
Types triangular and Pure and pulsating
sinusoidal.
Symbol
2
Unit 15 Electrical Circuit and their Application
2021/2022
Unit 15 assignment B
,Table of Contents
Section 1................................................................................................................................................2
HOW ARE THEY PRODUCED?.............................................................................................................3
AC and DC generator.....................................................................................................................3
Electrical motor..............................................................................................................................4
HOW IS DC ELECTRICITY KEPT?..........................................................................................................5
Root mean square (RMS)...............................................................................................................5
Section 2................................................................................................................................................6
DEFIBRILLATOR..................................................................................................................................8
Section 3................................................................................................................................................9
National grid......................................................................................................................................9
HYDROPOWER PLANT......................................................................................................................10
LOW VOLTAGE VERSUS HIGH VOLTAGE GENERATOR..................................................................11
Transformers...................................................................................................................................12
Section 4..............................................................................................................................................13
RESIDUAL CURRENT CIRCUIT BREAKERS VS. EARTH LEAKAGE CIRCUIT BREAKERS (RCCB)..............13
In the context of kettles and hair dryers, what does "double insulated" mean?.........................15
What are fuses and how do they operate in home appliances?..................................................15
RETIFICATION...................................................................................................................................15
What are the dangers and built-in protections?..........................................................................17
Section 5..............................................................................................................................................18
THE ELECTRICITY AT WORK REGULATIONS 1989.............................................................................18
REGULATION:...............................................................................................................................18
Bibliography.........................................................................................................................................19
1
, Section 1
Alternating current Direct current
In the city, it is safer to
Before it loses energy,
The amount of energy carry over longer
DC voltage can only
that can be carried distances and can
travel so far.
supply more electricity.
The cause of the Magnetism that remains
Along the wire, there is a
direction of flow of constant throughout the
rotating magnet.
electrons wire
Frequency 50-60 Hz 0
While passing through a
In the circuit, it only
Direction circuit, it reverses its
flows in one way.
direction.
It's the magnitude of a
It's a constant-
Current current that changes
magnitude current.
throughout time.
Electrons are constantly Electrons always travel
Flow of electrons
swapping directions. in the same direction.
Obtained from AC generator Cells
Passive parameters Impedance Resistance only
Power factor Goes between 0 and 1 Always 1
Trapezoidal, square,
Types triangular and Pure and pulsating
sinusoidal.
Symbol
2
