Physics · Practical apparatus

Find a virtual circuit fault

Distinguish an open lead from a reversed source and a bypassed load. Correcting the selected fault restores the expected current. A negative meter reading can indicate reversed polarity rather than a failed load.

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Find a virtual circuit fault

திறந்த இணைப்பையும் மாற்றிய துருவத்தையும் சுமை புறக்கணிப்பையும் வேறுபடுத்தவும். சரியான இணைப்பில் எதிர்பார்த்த மின்னோட்டம் கிடைக்கும்.

Key notes, relationships and model limits

Key relationship

Closed load: I=V/R; reversed source changes current sign; open connection gives I=0.

Practical tip

Common trap

Zero current alone does not identify the location of an open connection.

Model limits

Single ideal resistor circuit. Bypass condition is flagged and represented as a protective open state rather than unbounded short-circuit current. No real wiring operation occurs.

What you will learn

Diagnose a circuit using continuity and polarity reasoning.

Try the experiment

Try both scenarios, change one control, and predict the result before checking the graph and readouts.

Think of it this way

Change one input while keeping the others fixed, as you would in a controlled experiment.

Worked example

6 V and100 Ω gives+60 mA correctly connected or−60 mA reversed.

Why this matters

The model connects find a virtual circuit fault with an observable reading. Check the equation and assumptions before applying it.

Before you start

SI units · algebra · graph reading

Check your understanding

A reversed ideal supply with an intact resistor produces?

No current necessarily
A reversed current sign
Infinite resistance

Read the explanation

Voltage changes sign while resistance remains positive.

Course connection: Virtual apparatus preparation. Check exact board/exam membership in the syllabus sources. Physical practical work remains necessary.