find the resistance of a resistor, various currents were passed through the resistor and the corresponding voltage drops across it were measured.

1.To find the resistance of a resistor, various currents were passed through the resistor and the corresponding voltage drops across it were measured. The results obtained were

 

(a) Draw to a suitable scale the graph connecting these quantities, with current values horizontal, and from the graph estimate the resistance value. (b) One serious reading error has been made; estimate what the voltage reading should be.

2.A resistor is measured by the ammeter-and-voltmeter method, as in Figure 11.51. The ammeter and voltmeter readings are shown on the figure and the resistance of the voltmeter is 400_. Find the apparent and the true values ofR.

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A rotor-resistance starter for a three-phase wound-rotor induction motor

1. A rotor-resistance starter for a three-phase wound-rotor induction motor   (a) adds external resistance to the wound rotor via sliprings (b) is connected in series with the machine stator….

Calculate the resistance of a shunt required to convert it for use as a 0–10 A ammeter.

1.The instrument of Exercise 7 is to have a multiplier connected in series with it   to convert it for use as a voltmeter to read up to 50 V…..

To what do you assign the peaks at m/z 64 and 34?

Portable mass spectrometers are now available for monitoring gaseous emissions from volcanoes. Analyses after the eruption of the Turrialba Volcano in Costa Rica in January 2010 showed the presence of….