# Multisim and Ultiboard

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## Lamp Not Lighting

Hello Everyone.
I have just started to learn electronics. Today I build a simple circuit basing on ohm's law and it is not working. Please help and advise. Thank you.

My calculations are as follows:

We need to protect every component in the circuit.

1. Protect the current-controlled-switch ( S1 ) ( Rating 0.1A-0mA )

Using Ohm's Law,

V1 = I1 * R1

1.5 = 0.1 * R1  ( The maximum safe current that can pass through the switch = 0.1 A )

R1 = 15 Ω

Thus we need a 15 Ω resistor to protect S1.

• Protect the Lamp ( L1 ) ( Rating 12V-10W ).

P = I2 * V

10 = I2 * 12

I2 = 10/12 ( safe current through lamp )

V2 = I2 * R2

12 = ( 10/12) * R2

R2 = 14.4 Ω

My question: Why is the lamp not lighting with R1 as

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Solution
Accepted by topic author SatyamBhujan
11-11-2016 09:30 AM

## Re: Lamp Not Lighting

Hi

There is a little lost at the main switch, you need to increase the voltage on V1 and you will see the lamp shining

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## Re: Lamp Not Lighting

Hi Pedro_Rojas,

Thank you very much for the guidance. Indeed, the lamp is shining :-)

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