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Why Does Electrical Power Depend on Both Voltage and Current?

Why Does Electrical Power Depend on Both Voltage and Current?

by Raul Barrea | Oct 22, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Electrical power depends on both voltage and current because voltage tells us how much energy is transferred per coulomb of charge, while current tells us how many coulombs pass each second. Multiplying them gives the energy...
Why Does a Capacitor Still Have Voltage After Being Disconnected From a Battery?

Why Does a Capacitor Still Have Voltage After Being Disconnected From a Battery?

by Raul Barrea | Oct 22, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: A capacitor can still have voltage after being disconnected from a battery because opposite charges remain separated on its plates. These charges create an electric field and a potential difference, even when the battery is no longer...
Why Does Increasing the Distance Between Capacitor Plates Decrease Capacitance?

Why Does Increasing the Distance Between Capacitor Plates Decrease Capacitance?

by Raul Barrea | Oct 22, 2026 | article, Electricity & Circuits

Foundational Physics Short Answer: Increasing the distance between the plates of a parallel-plate capacitor decreases capacitance because the same separated charge produces a larger voltage across the wider gap. Since capacitance is charge divided by voltage, the...
Why Is the Average Kinetic Energy of Ideal Gas Molecules Related to Temperature?

Why Is the Average Kinetic Energy of Ideal Gas Molecules Related to Temperature?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: In an ideal gas, absolute temperature measures the average translational kinetic energy of its molecules. Raising the temperature increases that average energy, although individual molecules still move at different speeds. Sensei’s...
Why Can a Large Bucket of Warm Water Contain More Thermal Energy Than a Small Cup of Hot Water?

Why Can a Large Bucket of Warm Water Contain More Thermal Energy Than a Small Cup of Hot Water?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: Temperature tells you how hot water is, but the amount of thermal energy depends on how much water you have, too. A bucket can contain more internal energy even when its temperature is lower, because it contains much more...
Why Does a Balloon Expand When It Is Heated?

Why Does a Balloon Expand When It Is Heated?

by Raul Barrea | Oct 22, 2026 | article, Thermal Physics

Foundational Physics Short Answer: A balloon can expand when it is heated because the gas inside gets warmer and pushes harder against the flexible rubber. The rubber stretches until the pressure forces balance again. The gas then takes up more space. Sensei’s...
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