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The resistance of an electrical component can be found by measuring the electric current flowing through it and the potential difference across it.
Current resistance potential difference equation. Potential difference v is measured in volts v. This equation called ohm s law shows the. The formula for measuring potential difference is v w q and this formula is known as ohm s law. The potential difference can be calculated using the equation.
As an equation this serves as an algebraic recipe for calculating the current if the electric potential difference and the resistance are known. The equation v ir means that the potential difference or voltage across a resistor can be found by multiplying its resistance by the current flowing through it. V v i a r ω the power p in watts w is equal to the voltage v in volts v times the current i in amps a. Whether ac or dc current only flows through a circuit when a voltage source is connected to it with its flow being limited to both the resistance of the circuit and the voltage source pushing it.
And current that alternates back and forth through the circuit is known as alternating current or a c. P w v v i a ac ohm s law formula. In this equation v is equal to the potential difference w is the energy transferred or work done and q is the amount of the charge. Potential difference current resistance v i times r this is when.
When a voltage v and resistance are given then you ought to use a formula for current. The unit of potential difference is the volt v which is equal to a joule per coulomb j c. Current that flows in a single direction is called direct current or d c. You can calculate current using the given formula.
Find the current flowing through a 3 ω resistor when a potential difference of 30 v is applied across it. Potential difference can also be measured using the formula v ir where i is the current charge and r is the resistance. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Current i voltage v resistance r i amps v volts r ω for example.
This equation indicates the two variables that would affect the amount of current in a circuit.
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