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Can the instantaneous power output of an a.c. source ever be negative? can the average power output be negative?
Yes, the instantaneous power output of an A.C. source can be negative because power oscillates with the changing voltage and current. However, the average power output can never be negative since the net energy transfer over a cycle remains positive. For more visit here: https://www.tiwariacademy.coRead more
Yes, the instantaneous power output of an A.C. source can be negative because power oscillates with the changing voltage and current. However, the average power output can never be negative since the net energy transfer over a cycle remains positive.
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State the conditions under which power is (i) maximum, and (ii) minimum.
(i) Power is maximum when the power factor is 1, occurring in a pure resistive circuit or at resonance in an A.C. circuit. (ii) Power is minimum when the power factor is zero, occurring in pure inductive, pure capacitive, or their combination circuits. For more visit here: https://www.tiwariacademy.Read more
(i) Power is maximum when the power factor is 1, occurring in a pure resistive circuit or at resonance in an A.C. circuit.
(ii) Power is minimum when the power factor is zero, occurring in pure inductive, pure capacitive, or their combination circuits.
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The instantaneous current and voltage of an a.c. circuit are given by I = 10 sin 314 t A and V = 50 sin (314t + π/2) V. What is the power dissipation in the circuit?
The power dissipation in the circuit is zero because the voltage leads the current by 2π/2. Hence, the power factor cos ϕ = 0, and since power P = VI cosϕ, no power is dissipated. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-7/
The power dissipation in the circuit is zero because the voltage leads the current by 2π/2. Hence, the power factor cos ϕ = 0, and since power P = VI cosϕ, no power is dissipated.
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If suddenly the gravitational force of attraction between earth and a satellite revolving around it become zero, then the satellite will
If the gravitational force acting on a satellite were to suddenly become zero, the satellite would no longer experience the centripetal force required to maintain its curved orbital path. As a result, it would move in a straight line tangent to its original orbit, maintaining the velocity it had atRead more
If the gravitational force acting on a satellite were to suddenly become zero, the satellite would no longer experience the centripetal force required to maintain its curved orbital path. As a result, it would move in a straight line tangent to its original orbit, maintaining the velocity it had at the moment the gravitational force ceased.
This is due to the principle of inertia, where an object in motion continues in its state of motion unless acted upon by an external force. Therefore, without gravity to keep it in orbit, the satellite would follow a straight-line trajectory in the direction of its velocity.
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See lessExplain the proper technique for performing a rear shoulder stretch. How can you increase its intensity?
To perform a rear shoulder stretch, stand upright with feet together. Move both arms behind your back, interlock your fingers, and gently push your arms backward until you feel a stretch in your shoulders. For an intensified stretch, lean your upper body forward while continuing to push your hands bRead more
To perform a rear shoulder stretch, stand upright with feet together. Move both arms behind your back, interlock your fingers, and gently push your arms backward until you feel a stretch in your shoulders. For an intensified stretch, lean your upper body forward while continuing to push your hands backward. This stretch improves shoulder flexibility, relieves muscle tightness, and enhances posture, making it a valuable exercise in both warm-up and cool-down routines.
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