# 3.1 Play with battery energy

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TECHNOLOGY

## [lo 1.3]

Making an electrical circuit using a wet cell battery.

Equipment:

• A lemon to serve as an electrolyte.
• Small strips of copper and zinc / or a brass drawing pin and a steel paper clip that can serve as electrodes.
• Two lengths of copper wire for conductors.
• A light bulb and bulb stand to provide the light.
• Two paper clips for connecting the metal plates and the conductors.

Method:

• Cut the lemon in half and use one half.
• Attach the strip of copper / brass drawing pin to one side of the lemon and the zinc strip / paper clip to the other side.
• Connect a paper clip to each of the wires and slide the paper clips on to the plates.
• Attach the other ends of the wires to the light bulb.

Observation:

Does the light bulb glow?

Connect an ordinary battery (a dry cell) and experiment with the circuit until the light bulb lights up with this battery.

Draw a circuit diagram of the electrical circuit to illustrate the flow of the current when the light bulb glows.

How could you increase the chemical energy to improve the brightness of the light from the light bulb?

## [lo 1.3]

Experiment with each of the following suggestions and mark the suggestion that provides the best result:

## Cells can be connected in two different ways for making a battery.

• Cells are in series when a positive pole of one cell is linked to the negative pole of another cell. With increasing the number of cells connected in series, the current that is supplied becomes more powerful. This means that the light bulb will glow more brightly.
• Cells are linked in parallel when all the positive poles of the cells are connected with one another to create a positive connection with the battery.
• The negative poles are also connected like this. When the number of cells that are connected in PARALLEL increases, the cells can produce the same current for longer.

## [lo 1.3, 1.6]

Create different switches for an electrical circuit. See how may different types of switches used in electrical appliances you can identify.

1. What is a switch?

It is a device for opening or closing a circuit so that electricity can flow along the circuit or be prevented from flowing.

1. Make each of the following switches and connect each to a battery and a light bulb to see if they work. Strip the isolation (plastic) from the ends of the wires before attaching them to the paper clips and use an elastic band to hold them in position against the paper clip.

If you want to use two or more batteries alongside one another, you could place them inside a cardboard or plastic tube.

A sliding switch

A push-button switch

A click switch

A dimmer switch

What happens when you slide one paper clip towards the other? Design your own switch. Add labels and colour to explain what the components are.

• Make a prototype of your switch and connect it to a circuit. Is your design successful?
• What type of switch did you make?

Assessment

Learning Outcomes(LOs)

LO 1

TECHNOLOGICAL PROCESSES AND SKILLS

The learner will be able to apply technological processes and skills ethically and responsibly using appropriate information and communication technologies

Assessment Standards(ASs)

We know this when the learner:

1.3 performs, where appropriate, scientific investigations about concepts relevant to a problem, need or opportunity using science process skills;

 1.6 chooses one of these solutions, giving valid reasons for the choice, and further develops the choice with graphics and/or modelling;

can someone help me with some logarithmic and exponential equations.
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
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a perfect square v²+2v+_
kkk nice
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or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
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yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
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China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
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what is nano technology
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preparation of nanomaterial
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what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
how did you get the value of 2000N.What calculations are needed to arrive at it
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