By Thordarson Electric Mfg. Co.
Fall-Winter 1940-1941. Product details and costs, records, entire choice of Filament, energy and Audio Transformers.
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Additional info for Thordarson Transformer Catalog
Examples of primary cells include the Leclanch´e cell and the mercury cell. constant for a relatively long time. Its main advantages over the Lechlanch´e cell is its smaller size and its long shelf life. Typical practical applications include hearing aids, medical electronics, cameras and for guided missiles. 8 Secondary cells Lechlanch´e cell A typical dry Lechlanch´e cell is shown in Fig. f. 5 V when new, but this falls rapidly if in continuous use due to polarisation. The hydrogen film on the carbon electrode forms faster than can be dissipated by the depolariser.
The temperature coefficient of resistance of a material is the increase in the resistance of a 1 TLFeBOOK RESISTANCE VARIATION resistor of that material when it is subjected to a rise of temperature of 1° C. The symbol used for the temperature coefficient of resistance is ˛ (Greek alpha). 0043 / ° C for copper. e. 0043/° C for copper. 43 Some typical values of temperature coefficient of resistance measured at 0° C are given below: Copper Nickel Constantan Aluminium Carbon Eureka 23 Problem 9. An aluminium cable has a resistance of 27 at a temperature of 35° C.
C. 25 MJ when connected to a 250 V supply for 1 hour 45 minutes. Determine the power rating of the motor and the current taken from the supply. (5) 3 A 100 W electric light bulb is connected to a 200 V supply. Calculate (a) the current flowing in the bulb, and (b) the resistance of the bulb. (4) 4 Determine the charge transferred when a current of 5 mA flows for 10 minutes. (4) 5 A current of 12 A flows in the element of an electric fire of resistance 10 . Determine the power dissipated by the element.