5.7 Necessity of D.C. Motor Starter At starting‚ when the motor is stationary‚ there is no back e.m.f. in the armature. Consequently‚ if the motor is directly switched on to the mains‚ the armature will draw a heavy current (Ia = V/Ra) because of small armature resistance. As an example‚ 5 H.P.‚ 220 V shunt motor has a full-load current of 20 A and an armature resistance of about 0.5 . If this motor is directly switched on to supply‚ it would take an armature current of 220/0.5 = 440 A which
Premium Electric motor Electrical resistance Schematic
then we have Number of turns per volt = N_T/V =7/A =7/3.75=1.87turns/volts The power Rating for the Inverter transformer (KVA) = 2.0KVA‚ E2= 24V Assuming the efficiency of transformer= 85%: Then Input rating =output/Efficiency= 2000VA/0.85=2353VA …………..equation 17 I_p=P_1/V_P VP = 280V …………..equation 18 I_P=2353/280=8.4A
Premium Capacitor Transformer Electricity
PART I CHAPTER III DIODES APPLICATIONS –SPECIAL PURPOSE DIODES OBJECTIVES 3.1 I-V- characteristics of normal and zener diode and measurement of static and dynamic resistance 3.2 I-V characteristics on CRO 3.3 Clipping circuits using diodes 3.4 Clamping circuits using diodes 3.5 Diode as a voltage multiplier 3.6 Diode used as a meter over current protection INTRODUCTION SEMICONDUCTORS Semiconductors are materials which are used to manufacture all electronic and optoelectronic devices
Premium
highest voltage was Zn-C(Zinc and Carbon)‚ with an average of 1.02 volts. The second highest combination was Cu-Zn(Copper and Zinc)‚ which produced a mean of .86 volts. The third highest reading was C-Mg(Carbon and Magnesium)‚ with a voltage of .67. The fourth highest combination belonged to Cu-Mg(Copper and Magnesium)‚ with .52 volts. The fifth highest combination of electrodes was Zn-Mg(Zinc and Magnesium)‚ which created .37 volts. The sixth
Premium Oxygen Hydrogen Chemical element
a room and connected to electrodes. The teacher and the researcher would proceed to the next room which contained an electric shock generator and a set of controls labeled 15 volts to 375 volts to 450 volts. The 15-volt control was also labeled as Slight Shock‚ 375 volts was labels as Danger: Severe Shock and the 450-volt control was labeled as
Premium
in Detroit‚ Michigan‚ USA‚ GM manufactures its cars and trucks in 33 countries. Their European headquarters is based in Zurich‚ Switzerland. In 2005‚ 9.17 million GM cars and trucks were sold globally under the following brands: Buick‚ Cadillac‚ Chevrolet‚ GMC‚ Daewoo‚ Holden‚ Hummer‚ Opel‚ Pontiac‚ Saab‚ Saturn and Vauxhall. Early history General Motors was founded on Wednesday‚ September 16‚ 1908‚ in Flint‚ Michigan‚ as a holding company for Buick (then controlled by William C. Durant)‚ and
Premium General Motors
wired up to the electric shock generator. So that the ‘teacher’ (the real participant) believed the electric shock generator was real‚ he was given a 45 volt electric shock. The electric shock generator had a row of switches marked from 15 to 450 volts in 15 volt increments with adjectives describing how severe the shock was‚ and 435 and 450 volts were labelled “XXX”. The real participant was taken to an adjacent room where he was unable to see the ‘learner’ and could only hear him. Every time the
Premium Milgram experiment Shock
1. Fixed wiring methods shall be as provided for the following except for. a. audio signal processing b. amplification c. reproduction equipment d. canopy lighting system 2. According to the code‚ only such electric wiring‚ raceways‚ and cables used directly in connection with the elevator or dumbwaiter‚ including wiring for signals‚ for communication with the car‚ for lighting‚ heating‚ air conditioning‚ and ventilating the elevator car‚ for fire detecting systems‚ for pit sump pumps‚ and for heating
Premium Electrical wiring Voltage Circuit breaker
Introduction and Objective The action potential is an impulse of electrical activity. Action potential occurs when a neuron sends messages electrochemically down an axon called a nerve impulse. When a neuron is not stimulated or inactive‚ it is at resting potential. When a neuron is at rest‚ the electrical charge on the inside of the neuron is negative while the electrical charge on the outside of the neuron is positive. The resting membrane potential of a neuron is about -70 mV (mV = millivolts)
Premium Action potential
establishment of General Motors in Canada marked the beginning of a period of substantial economic development. The automotive industry is a tremendous contributor to the comprehensive level of economic growth experienced throughout the twentieth century. With the peak of industrialization finally realized‚ there existed opportunity for development and modernization of societies around the world. With this in mind‚ opportunity was present for the production of automobiles for use around the world
Premium Automotive industry Automobile General Motors