Power and Energy Solutions, Exercises of Electronics

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Key Feelzacd EE301 Power and Energy Homework Name Section Instructor Date ee 1. A 1000 watt load that operates for one hour consumes the same amount of 1) [ energy as a 100 watt load that operates for 10 hours. (T/F) \ooowe the = \\ewher looW -lLohy = IKWhr 2. A system with an input power of 50 watts and an output power of 20 watts has 2) / an efficiency of? (you must show your work) B) 50% C) 25% D) 20% 1> At. dou. oA = 40%, A Sow 4 3. A power supply outputs 25 W into a load. The power supply input voltage is 115 3) 4 f ie V and the input current is 0.5 A. What is the efficiency of the power supply? (you must show your work) Pn ayes See Sodm4A = 57S5W fe ely ge fore = Gary 4. The watt-hour is a unit of 4) a A) efficiency @®)_energy> C) torque D) power 5. If electricity costs 8¢ per kWh, how much will it cost to run a 2500 watt water 5) C ° ¢ heater for 3 hours? (you must show your work) 2$00W -3hr.ikw , &@+ = Eno¢ loooW kwhr 6. How much current will a 120 V motor with a 5 HP output and 70% efficiency 6) AL tA draw? (you must show your work) Gi flies EL OV iy AKA Co HP hk: Qo tee | I ae oe a ee SE Tes Met SORE SL ag ae Fi he (RY