Total voltage: $ x + (2x + 3) = 45 $. - Portal da Acústica

Understanding the Context

When dealing with electrical systems, voltage calculations often come in the form of linear equations. One common example is solving for an unknown voltage using a simple algebraic expression, such as the equation:

Total voltage: x + (2x + 3) = 45

This formula is essential for engineers, students, and technicians working with electrical circuits, particularly when analyzing voltage totals across components.

Key Insights

What Is the Equation Meaning in Electrical Context?

In circuit analysis, total voltage (or total potential difference) may be expressed algebraically. Here, the equation
x + (2x + 3) = 45
represents a sum of two voltage contributions—X volts and twice X plus 3 volts—equal to a known total voltage of 45 volts.

Breaking it down:

• x represents an unknown voltage.
  
• (2x + 3) models a linear contribution influenced by system parameters.
  
• The total equals 45 volts, reflecting Kirchhoff’s Voltage Law: voltages add linearly in series.

How to Solve: Step-by-Step Guide

Final Thoughts

Step 1: Combine like terms on the left-hand side.
x + (2x + 3) = 45
→ x + 2x + 3 = 45
→ 3x + 3 = 45

Step 2: Isolate x by subtracting 3 from both sides:
3x + 3 – 3 = 45 – 3
→ 3x = 42

Step 3: Divide both sides by 3:
x = 42 ÷ 3
→ x = 14

Final Check: Plug x = 14 into the original equation:
14 + (2×14 + 3) = 14 + (28 + 3) = 14 + 31 = 45
✅ Correct — the total voltage is verified.

Why This Equation Matters in Electrical Engineering