electricity Archives - Free ZIMSEC & Cambridge Revision Notes

Science:Lighting

By garikaib|2022-09-15T12:38:49+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Lightining is a result of electrostatic discharge. Image credit zmescience.com

Lightining is a result of electrostatic discharge. Image credit zmescience.com ZIMSEC O Level Combined Science Notes: Conductors and insulators

Clouds are poor conductors because they are made of mostly water particles
They may become charged due to friction forces within them […]
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Lightning and safety

By garikaib|2022-09-15T12:38:48+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Lightning conductors in action. Image credit ask.com

Lightning conductors in action. Image credit ask.com ZIMSEC O Level Combined Science Notes: Lightning and safety

Lightning has very high voltages
It can electrocute, maim or kill a person if they are struck
Several precautions can be taken to prevent this from happening:
People […]
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Current electricity

By garikaib|2022-09-15T12:38:48+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A simple circuit diagram

A simple circuit diagram ZIMSEC O Level Combined Science Notes: Current electricity

When electricity flows from one point to another through a conductor this is known as electric current
Electric current when electricity flows from one point to another through a conductor
If an electric cell is used

[…]

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Potential difference

By garikaib|2022-09-15T12:38:47+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A voltmeter in a circuit

A voltmeter in a circuit measuring potential difference between two points ZIMSEC O Level Combined Science Notes: Potential difference

Potential difference is the “electrical pressure” which causes current to flow in a circuit
The amount of current flowing depends on the potential difference of the circuit

[…]

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Experiment: Finding the resistance of a resistor using a voltmeter
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Experiment: Finding the resistance of a resistor using a voltmeter

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Finding the resistance of a resistor using a voltmeter

By garikaib|2022-09-15T12:38:45+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Finding the resistance of a resistor using a voltmeter

Aim: To find the resistance of a resistor in a circuit using voltmeter

Materials: cells, ammeter, resistor,switch, leads with crocodile clips

Finding Resistance

Method

Set up the circuit as shown above
Close the switch
Read and record values of the […]
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Resistors in parallel and in series
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Resistors in parallel and in series

Notes, O Level Science Notes, Ordinary Level Notes

Resistors in parallel and in series

By garikaib|2022-09-15T12:38:45+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

fusion_title size=”3″ content_align=”left” style_type=”default” sep_color=”” margin_top=”” margin_bottom=”” class=”” id=””]ZIMSEC O Level Combined Science Notes: Resistors in parallel and in series [/fusion_title]

Resistance in a series can be changed by placing more or less resistors in a circuit
The total resistance of resistors depends in the way in which they are arranged in the circuit
Resistors can be put in series or […]
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Electrical Power
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Electrical Power

Notes, O Level Science Notes, Ordinary Level Notes

Electrical Power

By garikaib|2022-09-15T12:38:43+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Electrical Power

Electric power is the rate of doing work or the rate of of using energy
Electric power is the rate which an electrical device is converting electrical energy into heat or light or any other form of energy e.g kinetic energy in an electric motor
When current flows through a wire some of […]
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Uses of generators

By garikaib|2022-09-15T12:38:34+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Generators have many uses.Image credit wheelerdealers.co.zw

Generators have many uses.Image credit wheelerdealers.co.zw ZIMSEC O Level Combined Science Notes: Uses of generators

In Zimbabwe there a number of Power Stations that generate electricity
In practice most generators are AC rather than DC generators
At Kariba there is a Hydro Electric station

[…]

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Transmission of electricity

By garikaib|2022-09-15T12:38:34+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The Power Grid. Image credit source.co.zw

The Power Grid. Image credit source.co.zw ZIMSEC O Level Combined Science Notes: Transmission of electricity

At Hwange, Kariba, Munyati and other places AC power is generated
This is because the most efficient power generators produce AC power
In addition to that AC power can be […]
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January 2023

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

Quick NetOne, Econet, And Telecel Airtime Recharge

2022 O Level Results Out