![]() These charged particles are protons and electrons. How to Use Ohm’s Law to Determine Current We’ve seen the formula for determining the power in an electric circuit: by multiplying the voltage in “volts” by the current in “amps” we arrive at an answer in “watts. Both neutral and charged objects contain particles that are charged. Now that we know the current, we can take that value and multiply it by the voltage to determine power: Using Ohm’s Law to determine current, we get: In the above circuit, we know we have a battery voltage of 18 volts and a lamp resistance of 3 Ω. This tells us that the lamp is dissipating (releasing) 108 watts of power, most likely in the form of both light and heat. ![]() Online schematic capture lets hobbyists easily share and discuss their designs, while online circuit simulation allows for quick design iteration and accelerated learning about electronics. Let’s try taking that same circuit and increasing the battery’s voltage to see what happens. These tools allow students, hobbyists, and professional engineers to design and analyze analog and digital systems before ever building a prototype. Likewise, the power will increase as well: Intuition should tell us that the circuit current will increase as the voltage increases and the lamp resistance stays the same. Now, the battery’s voltage is 36 volts instead of 18 volts. Get literal formulas and values for current intensities and voltages defined in the circuit. The lamp is still providing 3 Ω of electrical resistance to the flow of current. With Solve Elec you can: Draw and analyze electrical circuits functioning in direct current. ![]() This stands to reason: if I = E/R, and we double E while R stays the same, the current should double. With Solve Elec you can : - draw and analyze electrical circuits functioning in direct or alternating current. What does Increasing a Battery’s Voltage do to Power? Indeed, it has: we now have 12 amps of current instead of 6. Download now Visit the home page Version: 2. Notice that the power has increased just as we might have suspected, but it increased quite a bit more than the current. Solve Elec 2.5, an educational program to draw and analyze electrical circuits Download Review Comments (1) Questions & Answers (1) Download the latest version from Software Informer Scanned by 73 antivirus programs on Apr 16, 2023. ![]() Why is this? Because power is a function of voltage multiplied by current, and both voltage and current doubled from their previous values, the power will increase by a factor of 2 x 2, or 4. Using algebra again to manipulate the formula, we can take our original power formula and modify it for applications where we don’t know both voltage and current: If we only know voltage (E) and resistance (R): You can check this by dividing 432 watts by 108 watts and seeing that the ratio between them is indeed 4. ![]()
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