Question

Draw the voltage, power and energy profiles of a supercapacitor during charge and discharge under constant current excitation.

Answer #1

why voltage remains constant during discharge of nickel metal
halide

TOPIC: A step up transformer increases voltage
(energy per unit charge). Does this mean we can get "free" energy
using step-up transformers? Explain your answer.

When a flashlight is operated, what is being used up: battery
current, battery voltage, battery energy, battery power, or battery
resistance? Explain your reasoning. On the other hand, the equation
of power P = V2/R indicates that the power dissipated in
a resistor of the flashlight decreases if the resistance is
increased, whereas the equation P = I2R implies the
opposite. Is there a contradiction here? Explain.

In a constant uniform electric field, a particle with charge
−100 ?? is moved from the origin a distance ? = 0.80 ? straight in
the direction of the electric field lines. The field has a strength
of 5.0 ? ? .
a) What is the voltage difference between the initial and final
position?
b) How much work is done to move the charge?
c) Does the charge gain or lose electrical potential energy in
the process of this move?...

1. Design a full-wave bridge rectifier power supply to deliver
an average voltage of 9V with a peak-to-peak riple of 2V to a load.
The average load current is 100 mA. Assume that ideal diodes and
60-Hz ac volatage sources of any amplitudes needed are avaialable.
Draw the circuit diagram for your design, Specify the values of all
components used.
2. Repeat Problem 1 with 2 diodes and out-of-phase voltage
sources to form a full-wave rectifier.

During the boiling process, although energy is continuously
provided, the temperature of the water is constant. Explain where
the energy goes.

a) A capacitor of 10 µF is connected to the power supply of 8
Volts through a resistance of 2 MΩ. If Vc denotes the potential
difference across the capacitor, draw the graph between Vc vs t.
Also indicate the value of Vc at t = 0 and t = 50 seconds and mark
time constant on the time axis.
b) If a fully charged capacitor of C = 10μF discharges through
the resistance of 0.2MΩ. Find the time when...

Assume production takes place under constant opportunity costs.
Draw two sets of axes, one for Nation 1 and the other for Nation 2.
Draw two identical PPS’s, one for each country. Determine the
comparative advantage for each country (nation I and nation II) if
taste and preferences are different (i.e., each country has a
different set of taste and preferences. Label you graph
carefully.

During 3.2 hours of operation, a charge of 72 kC flows through
an electric space heater, while the heater generates heat at a rate
of 1.5kJ/s. The heater is connected to a constant DC voltage
source. Assume that the heating wire inside the heater has a
circular cross-section of a 0.5 mm radius and is made of a material
with a resistivity of 490 *10^-9m. How long is the wire?

•The 3-phase system consists of a generator, circuit breaker, power
transformer and extra high voltage transmission line.
•The generator is rated at 60Hz, 1559Mva and 24kV. The
sub-transient reactance is 2*%. The winding connection is wye with
the neutral grounded.
•The transformer is a 1550Mva, 3-phase, shell type, 2-winding
transformer with a 24kV delta winding and a 525kV grounded wye
winding. Neglect saturation and core losses. The exciting current
is 1.0% of the rated current. The capacitance of each low...

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