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Technology

Grade 7

Electricity

Module 10

What is electricity?

Background

Electricity is a type of energy. An object has electrical energy when it has the ability to conduct electricity. Electricity is measured in Volts.

Electrical energy can be easily converted to other forms of electricity.

There are two main types of electricity:

  • main stream electricity
  • battery electricity

Battery-electricity

Electrical energy are stored in batteries. The energy in batteries are called chemical energy. When electrical energy moves, the electrons flows in an electrical circuit.

The basic elements of an electrical circuit is:

a source of energy e.g. a battery

Sketch Symbol

a conductor e.g. a sort of metal in the shape of a wire

Sketch Symbol

a switch to form an open or closed circuit

Sketch Symbol

a load e.g. a source of light, sound, motion or heat

Sketch Symbol
a light
a buzzer
an electrical motor

Two or more of the same component in an electric circuit can be connected in two different ways in the circuit;

  • in series where a positive pole of one cell is linked to the negative pole of another cell;
  • in parallel where all the positive poles of the cells are connected with one another and all the negative poles are also connected like this.

Advantage of cells in series – current supply becomes more powerful

Advantage of cells in parallel – the cells can produce the same current for longer.

To the teacher:

These worksheets should be done in groups. Each group can construct a different circuit and then explain it to the rest of the class before completing a worksheet. A class should be divided into 7 groups, because there are 7 worksheets. This would save a huge amount of time. Each group should construct a test circuit with a switch, 1,5 V lamp, lamp holder and a 1,5 V cell in a cell holder. First screw the holders and switch on the board, add the wire between them and then add the cell and lightbulb.

Equipment and tools needed:

  • 1,5 V batteries
  • 1.5 V light bulbs
  • light bulb holders
  • wire/flex
  • 7 strip connectors
  • battery holders
  • 7 switches
  • small screws
  • flat nose and star screwdrivers
  • 7 pieces of insulation board 150 mm by 150 mm
  • connectors
  • buzzers with a low voltage
  • diodes and resistors

Assignment 1:

To investigate by means of a simple practical test[lo 1.3]

To extract relevant data [lo 1.4.4]

To evaluate the system [lo 1.12]

To show knowledge and understanding of electric circuits [lo 2.2]

WORKSHEET 1:

  • Connect one 1,5 V cell in a battery holder to a 1,5 V lamp in a lamp holder with wire and a switch on a piece of insulation board.
  • Make a simple drawing of the circuit.

1.3 Draw a circuit diagram of the circuit, using the correct symbols.

1.4 Underline:

The light bulb shines (very brightly/bright/dimly/ not at all).

WORKSHEET 2:

2.1 Connect one 1,5 V cell in a cell holder to two 1,5 V lamps in two lamp holders in parallel using wire and adding a switch on a piece of insulation board.

  • Draw a circuit diagram of the circuit.
  • Unscrew one of the lamps from its holder. What happens to the other lamp? Explain why this happens.
  • Underline:

The light bulbs shine (very brightly/ brightly/ dimly/ not at all).

Questions & Answers

what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
Wekolamo Reply
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Manix Reply
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
namakula Reply
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
Zyryn Reply
good👍
Jonathan
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
generally amnesi how long yrs memory loss
Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
Heidi Reply
treat them normal, if they want help then give them. that will make everyone happy
Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
continue.. sometimes due to these physical problems..the diagnosis may be misdiagnosed. treatment for autism. well it depends on the severity. since autistic kids have problems in communicating and adopting to the environment.. it's best to expose the child in situations where the child
Jharna
child interact with other kids under doc supervision. play therapy. speech therapy. Engaging in different activities that activate most parts of the brain.. like drawing..painting. matching color board game. string and beads game. the more you interact with the child the more effective
Jharna
results you'll get.. please consult a therapist to know what suits best on your child. and last as a parent. I know sometimes it's overwhelming to guide a special kid. but trust the process and be strong and patient as a parent.
Jharna
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Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
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