Velleman EDU01 Manuel d'utilisateur télécharger pdf (Page 11)

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Pag. 11

Required parts: 9V battery*, 1000 ohm resistor (brown black red ), red LED,

push-button

How it works: As long as the push button is

pressed, a closed circuit is formed that makes the

current flow and the LED lights up.

Current flows from the (+) of the battery to the

push-button, resistor, (+) of the LED and via the (-)

of the LED back to the battery.

Using a 1000ohm resistor the current will be about

0.007A (7mA).

Time to experiment:

What happens when you swap (+) and (-) of the led?

What happens when you replace the 1000 ohm resistor

with a 100K ohm resistor (brown black yellow gold) ?

Calculation of the resistor:

resistor = battery voltage – LED voltage

LED current

resistor = 9V - 1,8V = 1000ohm

0,007

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Velleman EDU01 Manuel d'utilisateur Page 11