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anonymous

  • one year ago

The formula for voltage (in volts) is given by V = IR, where I is the current in amperes, and R is the resistance in ohms. If a light bulb uses 0.4 amperes of current at a voltage of 1.8 volts, the formula to find R is , and the resistance of the bulb is ohms.

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  1. Astrophysics
    • one year ago
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    \[V = I R\] we're just solving for R here, so manipulate the variables here and solve for R, any idea?

  2. Astrophysics
    • one year ago
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    See I is being multiplied by R so all you have to do is use the opposite operation of what already exists to both sides, which would be...?

  3. anonymous
    • one year ago
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    .4r=1.8 right?

  4. Astrophysics
    • one year ago
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    Yes, now solve for r

  5. anonymous
    • one year ago
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    so r=4.5

  6. Astrophysics
    • one year ago
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    Yup, \[R = \frac{ V }{ I }\]

  7. anonymous
    • one year ago
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    thanks

  8. anonymous
    • one year ago
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    R=V/I=1.8V/0.4A=9/2ohm=4,5ohm You have Ohm's Law : ( I in amps ) = ( V in volts ) / ( R in ohms ) R in ohms = ( V in volts ) / ( I in amps ) R in ohms = ( 1.8 volts ) / ( 0.4 amps ) R in ohms = 4.5 ohms

  9. denisaboichuk
    • one year ago
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    32

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