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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.
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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Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.2\[V = I R\] we're just solving for R here, so manipulate the variables here and solve for R, any idea?

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.2See 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...?

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.2Yes, now solve for r

Astrophysics
 one year ago
Best ResponseYou've already chosen the best response.2Yup, \[R = \frac{ V }{ I }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0R=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
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