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1.7. Energy, work and power
A subsection of Physics, 0625, through 1. Motion, forces and energy
Listing 10 of 536 questions
The solar charger shown in is used to charge portable electronic devices in a part of the world without any other electricity supply. solar panels The dimensions of each of the solar panels are 0.25 m × 0.20 m. The solar power incident on 1.0 m2 of flat ground in this part of the world is 260 W. Calculate the total solar power incident on the two panels of the charger. solar power = The output of the charger is 0.95 A at 20 V. Calculate the efficiency of the charger. efficiency = Three devices A, B and C are connected together and then connected to the 20 V charger. The potential difference (p.d.) across A is measured as 14 V, across B it is 14 V and across C it is 6 V. Complete to show the arrangement of the devices connected to the charger. Draw devices B and C as similar boxes to the box shown for device A. device A output from charger 20 V Two other devices, D and E, have resistances of 20 Ω and 30 Ω. Calculate the total resistance of D and E when they are connected in parallel. total resistance =
0625_s13_qp_32
THEORY
2013
Paper 3, Variant 2
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Questions Discovered
536