What does the voltmeter read when the switch is open?
When both switches are open, the voltmeter across the battery reads 9V. The voltmeter is in series with the battery, and reads 9V. Therefore the emf of the battery must be 9V.
What happens to the voltmeter when the switch is closed?
When the switch is closed, the voltmeter reading drops to 2.96 V , and the ammeter A reads 1.66 A . Assume that the two meters are ideal, so they do not affect the circuit.
When switch S in the figure is open the voltmeter V?
When switch S in the figure is open, the voltmeter V of the battery reads 3.13 V. When the switch is closed, the voltmeter reading drops to 2.92 V, and the ammeter A reads 1.67 A. Assume that the two meters are ideal, so they do not affect the circuit.
Can a voltmeter close a circuit?
Yes it can. It is the way, voltmeters are made. they are always used in parallel. so when you connect it between two points it completes its own circuit.
Does current flow through voltmeter?
Voltmeters draw some extra current, whereas ammeters reduce current flow. Null measurements balance voltages, so there is no current flowing through the measuring device and the circuit is unaltered. Null measurements are generally more accurate but more complex than standard voltmeters and ammeters.
How can a voltmeter loading effect be reduced?
To minimize the loading of a voltmeter on any circuit, the designer must seek to minimize the current draw of its movement.
What is the meaning of buffer solution?
A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.
What are the two types of buffer solution?
Buffer solutions may be of two types: acidic and basic.