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Chapter 21: Q24CQ (page 772)

Why should you not connect an ammeter directly across a voltage source as shown in Figure21.48?(Note that script Ein the figure stands for emf.)

Short Answer

Expert verified

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

Step by step solution

01

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.

02

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.

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Most popular questions from this chapter

Apply the loop rule to loop abcdefgha in Figure 21.25

To measure currents in Figure \({\rm{21}}{\rm{.49}}\), you would replace a wire between two points with an ammeter. Specify the points between which you would place an ammeter to measure the following: (a) the total current; (b) the current flowing through \({{\rm{R}}_{\rm{1}}}\); (c) through \({{\rm{R}}_{\rm{2}}}\) ; (d) through \({{\rm{R}}_{\rm{3}}}\) . Note that there may be more than one answer to each part.

Aresistor, an uncharged1.50-渭贵capacitor, and an6.16-Vemf are connected in series. (a) What is the initial current? (b) What is the RC time constant? (c) What is the current after one time constant? (d) What is the voltage on the capacitor after one time constant?

Carbon-zinc dry cells (sometimes referred to as non-alkaline cells) have an emf of 1.54 V, and they are produced as single cells or in various combinations to form other voltages. (a) How many 1.54 V cells are needed to make the common 9 V battery used in many small electronic devices? (b) What is the actual emf of the approximately 9 V battery? (c) Discuss how internal resistance in the series connection of cells will affect the terminal voltage of this approximately 9 V battery.

(a) What resistance would you put in parallel with a \(40.00 - \Omega \) galvanometer having a \(25.0 - \mu A\) sensitivity to allow it to be used as an ammeter that has a full-scale deflection for \(10.0{\rm{ }}\mu A\) ?

(b) What is unreasonable about this result?

(c) Which assumptions are responsible?
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