AM.I.A.K11b

From the FAA library

• Aviation Maintenance Technician Handbook - Generalp. 12-76
  Chapter 12: Fundamentals of Electricity & Electronics › AC Measuring Instruments › Wattmeter

  voltage. For this reason, wattmeters are usually of the electrodynamometer type. [Figure 12-163] The movable coil with a series resistance forms the voltage element, and the stationary coils constitute the current element. The strength of the field around ... through it. The current, in turn, depends on the load voltage applied across the coil and the high resistance in series with it. The strength of the field around the current coils depends on the amount of current flowing through…

• Aviation Maintenance Technician Handbook - Generalp. 12-26
  Chapter 12: Fundamentals of Electricity & Electronics › Rheostat

  circuit. [Figure 12-58] Figure 12-59 shows a rheostat connected in series with an ordinary resistance in a series circuit. As the slider arm moves from point A to B, the amount of rheostat resistance (AB) is increased. Since ... rheostat resistance and the fixed resistance are in series, the total resistance in the circuit also increases, and the current in the circuit decreases. On the other hand, if the slider arm is moved toward point A, the total resistance…

• Aviation Maintenance Technician Handbook - Generalp. 12-70
  Chapter 12: Fundamentals of Electricity & Electronics › The Voltmeter

  order for the meter to be used to measure voltages greater than 50 mV, there must be added a series resistance to drop any excess voltage greater than that which the meter movement requires for a full-scale deflection ... Since RM is in series with the movement, it also carries 50 μA at full scale. 50 μA Therefore, for 1 volt full-scale deflection, the total resistance of the voltmeter is 20k Ω. That is, the multiplier resistance…