A dynamometer-type AC ammeter made of moving coils
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- How temperature effect conductivity? Explain with the help of following equation. m e'n7'a) A sinewave is having a frequency of 50 Hz and instantaneous value of 200 Volts at 1.5 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and i) The value of voltage at 1.6 milli seconds.1- A). Which of the following could be used as a discharge device in an inductive AC circuit? a) resistor b) diode c) metal oxide varistor d) "a" and "c", not "b" B. What is the purpose of a discharge device used in conjunction with opening a highly inductive circuit? a) to minimize the possibility of damage to the circuits insulation as a result of a high induced voltage b) to minimize the possibility of endangering the life of the person opening the controlling switch c) to allow the magnetic field to gradually collapse, thus limiting the value of the self-induced ernf d) all of the above C. The high voltage induced by an inductor when its circuit is opened could be used constructively for a) an automotive ignition system b) an electric fence c) both "a" and "b" d) neither "a" nor "b"
- DC-AC Circuits Approximately, how long does it take the circuit to have a current near 5A upon closing of the switch? 5V 5H O A. 25 seconds B. 5 seconds O C. 1 second D. O second O E. 0.2 secondsQ# 4 What current I is flowing around a loop shown in Figure and Draw this current as function of time. What happens if someone suddenly cuts the wire? hepe PFor the figure shown below if the current is moving clockwise around the coil. Which direction does the coil rotate? S O The whole coil moves down. The whole coil moves up. The right side goes down, and the left side goes up. The right side goes up, and the left side goes down.
- multirange ammeter was designed using direct method to give three scales with Rsh1= 0.001285989 0, Rsh2=0.000562552 0, and Rsh3=0.000100001 Q. The d'Arsonval meter has Rm=6 Q and full scale current of 1.5 mA. Find the ranges.? 8 (Ctrl) -Discuss the relationship between voltage break down and humidity, temperature and distance explain with curveDiscuss the difference between Alternating Current (AC) and Direct Current (DC)
- Each terminal of a small polarity-independent incandescent bulb is connected to the positive terminals of two (2) DC voltage sources. The negative terminals of these sources are connected together. The first voltage source can have a range of value from 0-12, incrementable by 1.5 volts every turn of the rotary switch (i.e. 0 V, 1.5 V, 3 V, 4.5 V .... 12 V). The voltage of the second source is unknown. Using a luxmeter, the brightness of the lamp was measured for every increment of voltage of the first source. The following observations were recorded: a. 1.5 V produces a higher brightness than 3 V b. 0 V produces a higher brightness than 1.5 V c. 12 V produces higher brightness than 9 V d. 12 V produces equal brightness as 3 V What is the voltage of the second source? Justify each observation.Which of the following is NOT a variable in voltametric methods? A. How the current is applied B. How the potential is applied C. The inclusion of convection D. All the above E. Type of working electrodeAn alternating current was measured by a DC milliammeter in conjunction with afull-wave rectifier. The reading on the milliammeter was 7.0 mA. Assuming thewaveform of the alternating current to be sinusoidal, calculate: (a) the r.m.s. valueand (b) the maximum value for the alternating current.