EPE-121-Assignment Prpblems- Chapter-1.docx

# A calculate the power at the terminals and state

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a) Calculate the power at the terminals and state whether the power is being absorbed or delivered by the element in the box. b) Given that the current is due to electron flow, state whether the electrons are entering or leaving terminal 2. c) Do the electrons gain or lose energy as they pass through the element in the box? Figure (2) - Polarity references and the expression for power.

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5) The manufacturer of a 1.5 V D-flashlight battery says that the battery will deliver 9 mA for 40 continuous hours. During that time the voltage will drop from 1.5 V to 1.0 V. Assume the drop in voltage is linear with time. How much energy does the battery deliver in this 40 h interval? 6) One 1.5 V battery supplies 20 mA to a boom box. How much energy does the battery supply in 3 h? 7) The voltage and current at the terminals of the circuit elements in Fig (1) are zero for t < 0 and for t ≥ 0, they are: v = 80 - 80e -1100t V, and i = 60e -1100t mA 8) The voltage and current at the terminals of the circuit element in Fig.(1) are zero for t < 0 and t > 50s. In the interval between 0 and 50 s, the expressions are v = t(1 - 0.030t) V if, 0 < t < 50 s; and i = 4 - 0.3t A if, 0 < t < 50 s a) At what instant of time is the maximum power delivered to the element? b) What is the power at the time found in part (a)?
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• Spring '16
• Nesma
• Volt, circuit element, Electrical Engineering course, Prof. Sabah Mohamed, E-JUST University

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