Ohm's Law Ohm's law describes the relationship among voltage, V, resistance, R, and current, I, according to V = RI 12.3 Note from Ohm's law, Equation (12.3), that current is directly proportional to voltage and inversely proportional to resistance. As electric potential is increased, so is the current; and if the resistance is increased, the current will decrease. The electric resistance is measured in units of ohms (N). An element with 1 ohm resistance allows a current flow of 1 amp when there exists a potential of 1 volt across the element. Stated another way, when there exists an electrical potential of 1 volt across a conductor with a resistance of 1 ohm, then 1 ampere of electric current will flow through the conductor.
Ohm's Law Ohm's law describes the relationship among voltage, V, resistance, R, and current, I, according to V = RI 12.3 Note from Ohm's law, Equation (12.3), that current is directly proportional to voltage and inversely proportional to resistance. As electric potential is increased, so is the current; and if the resistance is increased, the current will decrease. The electric resistance is measured in units of ohms (N). An element with 1 ohm resistance allows a current flow of 1 amp when there exists a potential of 1 volt across the element. Stated another way, when there exists an electrical potential of 1 volt across a conductor with a resistance of 1 ohm, then 1 ampere of electric current will flow through the conductor.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
The electric resistance of a light bulb is 145 Ω . Determine the value of current
flowing through the lamp when it is connected to a 120-volt source.
Using Ohm’s law, as shown , we have
V = RI
I = V/R = 120/145 = 0.83 A
Transcribed Image Text:Ohm's Law
Ohm's law describes the relationship among voltage, V, resistance, R, and
current, I, according to
V = RI
12.3
Note from Ohm's law, Equation (12.3), that current is directly proportional
to voltage and inversely proportional to resistance. As electric potential is
increased, so is the current; and if the resistance is increased, the current
will decrease. The electric resistance is measured in units of ohms (N).
An element with 1 ohm resistance allows a current flow of 1 amp when
there exists a potential of 1 volt across the element. Stated another way,
when there exists an electrical potential of 1 volt across a conductor with a
resistance of 1 ohm, then 1 ampere of electric current will flow through the
conductor.
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