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### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# Why should you not connect an ammeter directly across a voltage source as shown in Figure 21.48? (Note that script E in the figure stands for emf.)

One should not connect an ammeter directly across a voltage source because it can cause a short circuit.

See the step by step solution

## Step 1: Short-circuit

When the two terminals of a battery get in direct contact through a wire, when no load is attached to the wire, a large amount of current flows through it. Due to the flow of a large amount of current, the wire burns up, and the circuit breaks. This condition of the circuit is known as a Short circuit.

## Step 2: Explanation of why we should not connect an ammeter directly across a voltage source

To measure the current accurately we need an ammeter with the least resistance possible. This means that if we connect an ammeter directly to the circuit, it will offer almost no resistance and will create a condition called short-circuit. This could damage the ammeter.

Therefore, we should not connect an ammeter directly across a voltage source as it causes a short circuit.