Part A
If the voltage across a circuit of constant resistance is
doubled, how is the current in the circuit affected? If the voltage
across a circuit of constant resistance is doubled, how is the
current in the circuit affected?
1-The current is reduced by a factor of 4.
2-The current is doubled.
3- The current is reduced by a factor of 2.
4-The current remains constant.
5-The current is quadrupled.
The current through each resistor in the two-resistor circuit is _________ the current through the resistor in the one-resistor circuit (the circuit in Part A). The voltage across each resistor in the two-resistor circuit is ___________ the voltage across the resistor in the one-resistor circuit.
the same as / half
half / half
twice / half
half / twice
half / the same as
twice / twice
The voltage drop across an RLC circuit is:
v(t) = G*311.13*sine(377t) + 124.45*sine(1131t + 20) volts.
The current in the direction of the voltage drop is:
i(t) = 15.56*sine(377t) + 0.5*sine*(1131t - Φ)
Calculate:
a) The constants R, L, C of the circuit.
b) The angle value Φ
c) The average value of the power delivered to the circuit.
A constant voltage
is applied across a circuit. If the resistance in the circuit is
doubled, what is the effect on the power dissipated by the circuit?The power
dissipated is reduced by a factor of 4.The power
dissipated is reduced by a factor of 2.The power
dissipated is doubled.The power
dissipated remains constant.The power
dissipated is quadrupled.If the resistance
in a circuit connected to a constant current is halved, how is the
voltage in the circuit affected?The
voltage is reduced...
A device connected in a parallel circuit will undergo a higher
voltage drop compared to the same device connected in a series
circuit. is this true or false, and also why does this occur?
In a three-phase circuit the balanced delta load of (36 +j54)
ohms is fed by impedance conductors (5 +j70) ohms. If the generator
voltage is 120 V angle 0° phase A, calculate a) the bc voltage on
the load, b) the powers in the conductors, c) the bc voltage of the
delta load and d) the power delta on the load.
The terminal voltage across a single phase of a stepper motor
used as a generator is applied across a load resistor of 33 ohms.
This terminal voltage has an amplitude of 18.7V and a frequency of
242 Hz. From a previous measurement, we know that this stepper
motor phase has an internal resistance of 11.2 ohms. What is the
time-averaged power delivered to the load? What is the electrical
efficiency of this circuit? Write down an expression for the
instantaneous...
When a magnet is plunged into a coil at speed v, as shown in the figure, a voltage is induced in the coil and a current flows in the circuit. (Figure 1)
Part A
If the speed of the magnet is doubled, the induced voltage is ________.
a.) twice as great
b.) four times as great
c.) half as great
d.) unchanged
When a magnet is plunged into a coil at speed v, as shown in the figure, a voltage is induced in the coil and a current flows in the circuit. (Figure 1)
Part A
If the speed of the magnet is doubled, the induced voltage is ________.
a.) twice as great
b.) four times as great
c.) half as great
d.) unchanged
1)Why is there phase difference between voltage and current in
an a.c. circuit ?. Explain the concept of power factor.
2). Discuss the disadvantages of a low power factor.
3. Explain the causes of low power factor of the supply
system.
4. Discuss the various methods for power factor improvement
5)Write short notes on the following : (i) Power factor
improvement by synchronous condenser (ii) Importance of p.f.
improvement (iii) Economics of p.f. improvement