A voltmeter is also a device that shows the voltage difference across its termin

Question

A voltmeter is also a device that shows the voltage difference across its terminals, but it has a very large resistance. The next two problems show why.

C. Suppose a voltmeter having a resistance of 1500 ? were in series with a resistor of 50.0 ? as shown in the figure at the right.

- If the system is connected up to a 12 V battery, what would the voltage drop be across the voltmeter?

- What would the voltage drop be across the 50 ? resistor? Is this voltmeter giving a good measure of the voltage drop across the 50 ? resistor? Explain why or why not.

- Is this voltmeter giving a good measurement of what the voltage drop across the resistor would be if the voltmeter weren't there?

Explanation / Answer

Reff = 1550 ohms current in the ckt is i = 12/1550 = 0.0077 amps V at 50ohm resister is = 0.0077* 50 = 0.387 volts yes, voltge decreases drastically, t potential drop is very large when addedf voltage in series,

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.