Electric Circuit

Discussion in 'Physics' started by mercury, Mar 13, 2004.

  1. mercury

    Thread Starter New Member

    Mar 13, 2004
    3
    0
    i have a question

    what is the difference in brightness when two lights set in series is compared with the brightness one light in a circuit(series)?

    AND

    What is the difference in brightness when two lights set in parallel is compared with the brightness of one light in a circuit

    i would be really thankful if you can answer my question. my e-mail is mercury_yang@hotmail.com
     
  2. haditya

    Senior Member

    Jan 19, 2004
    220
    0
    Hi
    U may be aware that light bulbs have 2 specifications for working at optimum efficiency:-
    1. Power Rating in watts (50W, 40 W etc) say W watts
    2. Voltage rating in volts ( 230V, 110V etc)say V volts

    It means that when a light bulb is connected across a potential difference of V volts(as specified) it provides a power output of W watts.
    So connecting 2 bulbs in series across a potential difference of V volts, 0.5V volts is dropped across each bulb. Therefore each bulb only work to half their specified efficiency and produce a brightness that is half the optimum brightness

    On connecting the 2 bulbs in parallel V volts is dropped across each bulb thus producing an output equal to the specified output in each bulb.

    Hope this helps u.
     
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