Total voltage: $ x + (2x + 3) = 45 $. - Parker Core Knowledge
Title: Solve Total Voltage Equation: x + (2x + 3) = 45 Explained Clearly
Title: Solve Total Voltage Equation: x + (2x + 3) = 45 Explained Clearly
Understanding and Solving the Total Voltage Equation: x + (2x + 3) = 45
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.
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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:
xrepresents 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
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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
Solving equations like x + (2x + 3) = 45 is not just academic—it’s crucial for:
- Calculating total voltage drop across series resistors
- Balancing voltage supplies in power systems
- Troubleshooting circuit imbalances
- Designing control circuits with precise voltage references
Understanding how to algebraically manipulate such expressions enables faster diagnosis and accurate modeling in electrical systems.
Pro Tip: Practice with Real-World Voltage Scenarios
Try modifying the equation with actual voltage values you might encounter—e.g., voltage drops, resistance-based voltage divisions, or power supply combinations—to strengthen your skills. For example:
Total voltage across two segments of a circuit: x + (3x – 5) = 60 volts.
