How To Calculate The Voltage Drop Across a Resistor - Electronics

TL;DR

Learn how to calculate the voltage drop across a resistor using Ohm's Law and the current flowing through the circuit.

Transcript

in this video we're going to talk about how to calculate the voltage drop across a resistor so let's draw a circuit so this is the electrical symbol for battery and that is for a resistor now this is the positive terminal of the battery and here we have the negative terminal of the battery now we're going to use a 20 volt battery this is going to b... Read More

Key Insights

• ⚡ The voltage drop across a resistor can be calculated using Ohm's Law (V = IR), where V is voltage, I is current, and R is resistance.
• 🍹 In a series circuit, the total resistance is the sum of all the resistors in the circuit.
• 🌂 Kirchhoff's voltage law states that the sum of the voltages around a closed loop in a circuit must add up to zero.
• 💦 The voltage drop across each resistor in a series circuit can be found by multiplying the current and resistance values for each individual resistor.
• ⚡ The voltage drops in a series circuit add up to the voltage of the battery or power source.
• 👻 Parallel circuits allow the current to flow in multiple paths, while series circuits have only one path for the current.
• 💐 Electrons flow from the negative terminal of the battery to the positive terminal, while conventional current flows in the opposite direction.

Questions & Answers

Q: How can you calculate the voltage drop across a resistor in a circuit?

To calculate the voltage drop, you need to know the resistance and the current flowing through the resistor. Use Ohm's Law (V = IR) to multiply the current and resistance values together.

Q: What is the difference between a series circuit and a parallel circuit?

In a series circuit, the current has only one path to flow through the resistors, while a parallel circuit allows the current to flow in multiple directions through different paths.

Q: How do you calculate the total resistance in a series circuit?

To calculate the total resistance in a series circuit, simply add up the resistances of all the resistors in the circuit.

Q: What does Kirchhoff's voltage law state?

Kirchhoff's voltage law states that the sum of the voltages around a closed loop in a circuit must add up to zero.

Summary & Key Takeaways

• The video explains how to calculate the voltage drop across a resistor in a series circuit using Ohm's Law.

• It demonstrates the calculation process using two examples with different resistors and voltage sources.

• The video also illustrates how to find the potential difference between two points in a circuit.