Ohm S Law Power Equation

In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

Ohm s law power equation. The ohm s law wheel represents all possible relationships between power p resistance r current i and voltage v. How to use ohm s law to determine current. If a voltage of 10 volts is placed across a 500 ohm resistor determine the amount of current that will flow. When current and resistance are given use v ir to calculate voltage.

Ohm s law calculations with power in the four tables below you may enter two of the four factors in ohm s law. If a clock expends 2 w of power from a 1 5 v battery what amount of current is supplying the clock. To help us understand the the relationship between the various values a little further we can take all of the ohm s law equations from above for finding voltage current resistance and of course power and condense them into a simple ohms law pie chart for use in ac and dc circuits and calculations as shown. We ve seen the formula for determining the power in an electric circuit.

Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Learn the power formula. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. By multiplying the voltage in volts by the current in amps we arrive at an answer in watts let s apply this to a circuit example.

Calculate power current voltage or resistance. Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. Ohm s law and power equation practice worksheet 12. V v i a r ω.

Ohms law pie. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms. Just enter 2 known values and the calculator will solve for the others. Looking at the ohms law triangle the current is the unknown leaving the voltage and resistance as the known values.

In this way the current is found by dividing the voltage by the resistance. Ohms law calculation example. To use the wheel select the wanted quantity from the inner circle of the wheel and then the appropriate formula in that quadrant based on what you know about the electrical current you are working with. Tommy runs his juicer every morning.

Let s take a look at formulas. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Ohms law pie chart. By lumping ohm s law with joules law one can easily achieve the formula for power.

If a blender is plugged into a 110 v outlet that supplies 2 7 a of current what amount of power is used by the blender.