How to calculate the voltage drop across a resistor?
Understand the Problem
The question is asking how to determine the voltage drop across a resistor in an electrical circuit, which typically involves the use of Ohm's Law.
Answer
V = I imes R
Answer for screen readers
Using Ohm’s Law, the voltage drop across a resistor can be calculated by multiplying the current flowing through the resistor by the resistance of the resistor.
Steps to Solve
- Identify the given values
To calculate the voltage drop across a resistor, you need to know the current flowing through the resistor and the resistance of the resistor. Let’s denote the current as $I$ (in amperes, A) and the resistance as $R$ (in ohms, Ω).
- Use Ohm’s Law
Ohm’s Law relates the voltage drop ($V$), current ($I$), and resistance ($R$) in the circuit. Ohm’s Law is given by the formula:
$$ V = I \times R $$
- Substitute the known values into the formula
Insert the values of current ($I$) and resistance ($R$) into the equation to find the voltage drop ($V$). For example, if the current $I$ is 2 A and the resistance $R$ is 3 Ω, then:
$$ V = 2 \text{ A} \times 3 \text{ Ω} $$ $$ V = 6 \text{ V} $$
Using Ohm’s Law, the voltage drop across a resistor can be calculated by multiplying the current flowing through the resistor by the resistance of the resistor.
More Information
Ohm's Law is fundamental in electrical engineering and physics, describing the linear relationship between voltage, current, and resistance.
Tips
A common mistake is using incorrect units, so always make sure to use amperes for current (I) and ohms for resistance (R).
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