Thames & Kosmos Physics Solar Workshop handleiding

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Thames & Kosmos

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Handleiding

Switching the Solar Module

If it is the solar module that determines the direction

of the ﬂow of current, it should be possible to change

the rotation direction of the engine by mounting the

module the other way around.

Experiment 8

> You will need: your solar model

Instructions

Run your model in bright sunlight. Note the direction

of rotation of the sprocket wheel. Mount the solar

module the other way around on the battery holder.

What happens?

Results

When the module is turned around, the electricity

ﬂows in the other direction, which makes the engine

run in the opposite direction as well. If you want to re-

verse the direction of movement of a model — wheth-

er to make a vehicle go forwards and backwards or to

wind a cord up or down — it is easiest just to mount

the module the other way around.

Battery Power

The Sun only shines in the day — so it can’t run your

engine at night. That is why the engine also runs on a

battery, so you can still perform your experiments.

Experiment 9

> You will need: your solar model, a 1.5-V AA bat-

tery

Instructions

Switch out your solar module for a 1.5-V AA battery.

When you insert it, pay attention to the plus and

minus signs. Watch what happens.

Results

The battery turns the motor and the wheel just as well

as the solar module. Of course, the engine doesn’t

stop when you change the lighting, as it does with

the solar module. If you want to shut off the engine,

you have two options: either remove the battery from

the holder or pull out one of the cables. It makes no

difference whether you remove the cable from the

engine or the battery holder.

You can also change the rotation direction of the

engine in exactly the same manner as when it is run-

ning by solar power — the engine runs in the oppo-

site direction when you reverse the orientation of the

battery. Or, of course, you can still switch the cables at

the battery holder or the engine.

Batteries cost money, get used up quickly and pollute

the environment. The Sun’s light, on the other hand,

is available in large quantities for free, and it doesn’t

pollute the environment. Therefore, whenever light

conditions permit, you should avoid using battery

power. It is only a solution of last resort. If you do use

batteries, it is best to use rechargeable ones, since

they are more environmentally friendly. Large solar

facilities, in fact, charge rechargeable batteries during

the day so that electricity is also available at night.

If the Sun isn’t shining, you can also run your engine with a battery.

This should only be done when absolutely necessary, though, and not

as a rule.

The battery holder with battery

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