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ELECTRICAL ACTION 5
K. 91. Why do wires heat when overloaded?
>2. Does resistance increase rapidly when wires are overloaded ?
• 93. What is the reason for fixing maximum capacity for wires?
94. In a wire of fixed diameter, what three things increase it
resistance ? /
95. In a wire of fixed diameter, how may resistance be decreased ?
96. In calculating resistance of a circuit must both wires be
considered? .
97. How may resistance in copper circuits he calculated ?
The Watt, pack 2o
98. What is the watt and for what is it used ?
99. What is a kilowatt ?
100. What is a kilowatt hour (K.W.H.) ? ' 101. How are watts calculated?
102. How are kilowatt hours calculated ?
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Ack #
Use of Electrical Terms in Calculations, paci 26
J03. In calculating resistance of projector circuits what various things must be considered ?
104. Does the light source itself offer high resistance?
105. In expressing calculations, what letters are used to represent
voltage, amperage and ohms resistance ?
E
106. In considering letter formulas, what does — mean?
I
107. In presenting a formula as a common fraction, if two letters
appear above or below the line, with no mark between, what does it mean? If a — sign appear between, what does it indicate?
108. Quote Ohm's law and explain its action.
109. If a 110 volt electric light bulb uses 0.5 of an ampere, whai
is its resistance, in ohms?
110. If the resistance he 220 ohms and the amperage 0.5, what
is the line voltage?
111. What is the "Rule O' Thumb"? Explain its action.