EBN111_ST1_2014.pdf

# B n lithium battery voorsien n konstante 1 ma en 5 v

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b) ‘n Lithium-battery voorsien ‘n konstante 1 mA en 5 V vir 1 volle dag aan ‘n selfoon. Bepaal die hoeveelheid energy wat verbuik is. c) Elektrisiteit kos R5/kWh. ‘n 3kW Russel-Hobbes ketel benodig 20 sekondes om 100 milliliter water te kook. Wat is die koste om 1.5 liter water te kook? d) Die verandering in die stroom wat deur ‘n element vloei word in die onderstaande grafiek aangedui. Bepaal die totale lading wat deur die element vloei tussen 0 ms en 2 ms. Question 1.1 [4] a) An LED light is connected to a 9 V battery and absorbs energy according to the following equation: g1875=10g46661−0.2g1872g4667 J. Determine the power used at t = 5 s. b) A Lithium-battery supplies a constant 1 mA and 5 V for one full day to cellphone. Determine the amount of energy used. c) Electricity costs R5/kWh. A 3kW Russel-Hobbes kettle needs 20 seconds to boil 100 milliliter of water. What is the cost to boil 1.5 liter of water? d) The change in the current through an element is shown in the graph below. Determine the total charge through the element between 0 ms and 2 ms. 4 2 1 3 t [ms] i [A] 5 – 5 – 2.5 2.5

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EBN111 2014-ST1 3 Vraag 1.2 [3] Bepaal P 1 , P 2 en P 3 . Question 1.2 [3] Determine P 1 , P 2 and P 3 .
EBN111 2014-ST1 4 VRAAG/QUESTION 2 [16] Vraag 2.1 [3] Bepaal die aantal takke, nodusse en onafhanklike lusse vir onderstaande kringbaan. Question 2.1 [3] Identify the number of nodes, branches and independent loops for the circuit below. uni0035uni0030uni03A9 uni0034uni0041 uni0035uni0056 uni0035uni0030uni03A9 uni0035uni0030uni03A9 uni0030uni002Euni0034 uni0076 uni0030 uni002B uni002D uni0035uni0030uni03A9 uni0035uni0030uni03A9 uni0035uni0030uni03A9

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EBN111 2014-ST1 5 Vraag 2.2 [3] Bepaal I , v 0 .en R .
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