By Milton Gussow
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Extra info for Schaum's outline of theory and problems of basic electricity
Sample text
3-9)and substitute given values. kWh = kW x h Energy delivered = 20 kWh = lO(2) = 20 Ans. 1 Write the word or words which most correctly complete the following statements. The four basic parts of a complete circuit are the , and A fixed resistor is one which has a resistance value. is deposited upon a ceramic core. In a carbon-film resistor, a film of rating of a resistor indicates how much current the resistor can The conduct before becoming The physical size of a resistor has no relationship to its The two most common types of variable resistors are called and 9 9 The rated resistance of a variable resistor is the resistance between its terminals.
How many watts of power are dissipated in the resistor? What must be the wattage rating of the resistor in order to dissipate this power safely as heat? Ans. 3W, 6 W Ans. No Ans. 330 W Ans. 4190 W CHAP. 31 49 OHM’S LAW AND POWER Ans. 01 A. 27 Find the current through a 40-W lamp at 110 V. 25 A. Find its operating voltage. 29 Fill in the indicated quantity. Ans. 364 A 111 V Ans. Ans. 8 kW of energy. Ans. 3 percent Find its efficiency (See Prob. 7). 31 A generator receives 7 hp and supplies 20 A at 220 V.
10 How much energy is delivered in 2 h by a generator supplying 10 kW? Write Eq. (3-9)and substitute given values. kWh = kW x h Energy delivered = 20 kWh = lO(2) = 20 Ans. 1 Write the word or words which most correctly complete the following statements. The four basic parts of a complete circuit are the , and A fixed resistor is one which has a resistance value. is deposited upon a ceramic core. In a carbon-film resistor, a film of rating of a resistor indicates how much current the resistor can The conduct before becoming The physical size of a resistor has no relationship to its The two most common types of variable resistors are called and 9 9 The rated resistance of a variable resistor is the resistance between its terminals.