Question bank: Electricity: Voltmeters and Ammeters

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Question 1:

Very Hard

In a physics laboratory, a student needs to measure the current and the potential difference in a complex electrical circuit. For this, he uses an ammeter and a voltmeter, respectively. The ammeter is connected in series to a 20-ohm resistor and the voltmeter is connected in parallel to the same resistor. The voltage source of the circuit is calibrated to provide a constant potential difference throughout the circuit. The voltmeter is an ideal device, while the ammeter has an internal resistance of 0.1 ohms. The student observes that the voltmeter indicates a potential difference of 200 volts and the ammeter registers a current of 5 A. Considering the specifications of the devices and the circuit configuration, calculate the potential difference that the source provides, taking into account the instrument readings. Consider that the readings of the devices correspond to the actual values of the circuit and disregard any thermal effects on the circuit's wires and connectors.

Electricity: Voltmeters and Ammeters

Contextualized Question

Calculus Question

Question 2:

Medium

An ammeter is a measuring instrument capable of measuring the intensity of electric current in an electric circuit. For this, it is connected in series in the circuit, so that all the current passing through the circuit also passes through the ammeter. Which of the alternatives below makes a correct statement about the use of the ammeter in a circuit?

Electricity: Voltmeters and Ammeters

Contextualized Question

Question 3:

Medium

A technician in electronics needs to measure the current and potential difference in a circuit of resistors. He uses ideal ammeter and voltmeter, which do not disturb the circuit when connected. The ammeter is placed in series with the circuit to measure the current and records a value of 0.2 A. The voltmeter is placed in parallel with one of the resistors, which has a resistance of 100 ohms, and records a potential difference of 20 V. Considering that the ideal instruments do not affect the measurements, and that the circuit has a continuous voltage source, calculate the total resistance of the circuit and the potential difference provided by the continuous voltage source. Additionally, discuss how the readings of the instruments could be affected if they were not ideal, considering practical aspects of their construction and operation.

Electricity: Voltmeters and Ammeters

Multidisciplinary Question

Question 4:

Medium

You are working in an electronics laboratory and need to measure the voltage and electric current of a simple electrical circuit. The circuit consists of a 100Ω resistor connected to a 12V battery, and you have a voltmeter and an ammeter available. In which positions of the two measuring devices should you connect them in the circuit to obtain the correct measurements of voltage and current?

Electricity: Voltmeters and Ammeters

Question 5:

Medium

Electricity: Voltmeters and Ammeters

IARA TIP

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