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The equation can be rearranged to calculate the current being produced 1 Amp 1 Watt/1 Volt. But you know that already Recall that above you learned that a typical human at rest is burning 80 watts. Next, let’s learn about the relationship between voltage, current, and resistance with Ohm’s Law. The work done by the current over time is called power. This should lay the foundation of understanding the basic terms needed to start solving circuits. It’s the combination that creates the power. Or water spilling out of a cup on a table may have flow but there’s no potential behind it to do any work. Much like a raindrop falling won’t create a usable amount of power, a huge voltage without any current won’t produce much power. But if you have too little of one or the other, there isn’t much power. ![]() Or you can have a very large flow from a relatively low height create a lot of power. Going back to the water analogy, you can have a small flow from a great height produce a lot of power. This means that the charge travels as an electric current. But, given equal physical sizes, the battery can lift a box a total of 5,000 feet before running out of energy but a capacitor can lift a box a total of 300 feet before running out of energy.”Įlectric power, mathematically, is simply current times voltage, so is a factor of both flow and potential. Charge moves through a circuit, losing potential energy as it goes. Expanding on the box example and using some arbitrarily chosen numbers, what this means is that a capacitor can lift a box 100 feet in the air in one second, while a battery the same physical size can only lift a box 10 feet in the air in one second. “Batteries are more energy dense than capacitors but capacitors are more power dense than batteries. It may be 10 volts from the top to the bottom, but it’s also -10 volts from the bottom to the top, so v ab = -v ba. It makes even more sense when you realize that, since everything is relative, you can flip your perspective and invert the sign of the voltage. It may seem odd to do that sometimes but once you get some experience with circuits and electricity, negative voltages make a lot of sense. But then sometimes you get negative voltages, which just means that the electric potential at that point is below what we established as our “ground” potential. We typically assume that the lowest point is “0” or what we call “ground” as a reference. This mechanism can be understood by considering the. It is the same with voltage - when we talk about voltage, we’re talking about the electric potential between two points in relation to each other. This flow of electric charges constitutes the output electric current supplied by the generator. You can use this online calculator to check the solution of problems for electric. It can calculate current, voltage, resistance, work, power and time depending on what variables are known and what are unknown. ![]() But what if we dug a hole at the bottom of the hill and made the bottom even lower? Or what if there were a mountain next to the hill? The hill is lower than the mountain, so there is a potential between the mountain and the hill, much as the bottom of the hill is a higher potential than a hole dug at the bottom. This online calculator can help you solve the problems on work done by the current and electric power. For example, the top of the hill is obviously higher than the bottom of the hill. To find the resistance(R) of the circuit:Īnswer: The resistance of the circuit 4Ω.One final thing about voltage - note that difference between one potential and another is relative. Using the current formula, find the resistance of the circuit. Using the current formula find the potential difference.Įxample 3: In an electric circuit, the potential difference is 20 V and the value of current is 5 Amp respectively. To find: Current(I) flowing in the circuit.Īnswer: Current flowing in the circuit is 5 Ampere.Įxample 2: The total current flowing in an electric circuit is 50Amp whereas the resistance of the wires is 14Ohm. Using the current formula, find the current flowing in the circuit. Work done is given by the relation : W charge × potential difference W Q × V As we know that Q I × t Therefore putting in above equation W I × t × V V. With Cuemath, find solutions in simple and easy steps.īook a Free Trial Class Examples Using Current FormulaĮxample 1: In an electric circuit, the potential difference and the resistance are given as 20V and 4Ω respectively. The electric energy that is delivered by an electric current is the product of its power and time over which it flows which are Voltage, Current and Time. Use our free online calculator to solve challenging questions.
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