Circuit Diagram Examples in Physics

Start with the recap, study the fully worked examples, then use the practice problems to check your understanding of Circuit Diagram.

This page combines explanation, solved examples, and follow-up practice so you can move from recognition to confident problem-solving in Physics.

Concept Recap

A simplified drawing of an electrical circuit using standardized symbols for components like batteries, resistors, switches, and bulbs.

A circuit diagram is like a map for electricity — it shows what's connected to what without drawing realistic pictures.

Read the full concept explanation →

How to Use These Examples

  • Read the first worked example with the solution open so the structure is clear.
  • Try the practice problems before revealing each solution.
  • Use the related concepts and background knowledge badges if you feel stuck.

What to Focus On

Core idea: Standard symbols let engineers worldwide read and build the same circuit from the same diagram.

Common stuck point: The physical layout of a circuit can look very different from its schematic diagram.

Sense of Study hint: When reading a circuit diagram, start at the positive terminal of the power source and trace the path through each component back to the negative terminal. Identify whether components share the same current path (series) or branch into separate paths (parallel). Then apply the appropriate rules for each arrangement.

Worked Examples

Example 1

easy
A circuit diagram shows a 6 \text{ V} battery connected to a 2 \text{ } \Omega resistor with an ammeter in series. What reading does the ammeter show?

Solution

  1. 1
    An ammeter is connected in series to measure current through a component.
  2. 2
    The ammeter has negligible resistance, so it does not significantly affect the circuit.
  3. 3
    Current: I = \frac{V}{R} = \frac{6}{2} = 3 \text{ A}

Answer

I = 3 \text{ A}
Circuit diagrams use standard symbols for components. An ammeter (circle with 'A') is always placed in series with the component whose current you want to measure, since current must flow through it.

Example 2

medium
A circuit diagram shows a 10 \text{ V} battery, a 5 \text{ } \Omega resistor, and a voltmeter connected in parallel across the resistor. The circuit also has a 2 \text{ A} current. What does the voltmeter read? Is the voltmeter connection correct?

Practice Problems

Try these problems on your own first, then open the solution to compare your method.

Example 1

medium
A circuit diagram shows three resistors: R_1 = 2 \text{ } \Omega in series with a parallel combination of R_2 = 6 \text{ } \Omega and R_3 = 3 \text{ } \Omega. A 12 \text{ V} battery powers the circuit. What is the total current?

Example 2

hard
A circuit diagram shows a 12 \text{ V} battery connected to: R_1 = 4 \text{ } \Omega in series with two parallel branches — one with R_2 = 6 \text{ } \Omega and the other with R_3 = 3 \text{ } \Omega in series with R_4 = 3 \text{ } \Omega. Find the total current and the current through R_2.
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Background Knowledge

These ideas may be useful before you work through the harder examples.

circuitseries circuitparallel circuit