Voltage and current to work done time
It makes even more sense when you realize that, since everything is relative, you can flip your perspective and invert the sign of the voltage. It may seem odd to do that sometimes but once you get some experience with circuits and electricity, negative voltages make a lot of sense. But then sometimes you get negative voltages, which just means that the electric potential at that point is below what we established as our “ground” potential. We typically assume that the lowest point is “0” or what we call “ground” as a reference. It is the same with voltage - when we talk about voltage, we’re talking about the electric potential between two points in relation to each other. But what if we dug a hole at the bottom of the hill and made the bottom even lower? Or what if there were a mountain next to the hill? The hill is lower than the mountain, so there is a potential between the mountain and the hill, much as the bottom of the hill is a higher potential than a hole dug at the bottom. For example, the top of the hill is obviously higher than the bottom of the hill. (ii) the frequency? Justify your Answer.One final thing about voltage - note that difference between one potential and another is relative. How does the brightness of the lamp change on reducing the source is glowing with certain brightness.
#Voltage and current to work done time series
(All India 2009)Īn electric lamp having coil of negligible inductance connected in series with a capacitor and an a.c. Find the capacitive reactance and the rms current. This decreases the brightness of the bulb.Ī 15.0 ♟ capacitor is connected to 220 V, 50 Hz source. (ii) When the copper sheet is inserted, eddy currents are set up in it which opposes the passage of magnetic flux. (i) The phenomenon involved is mutual induction. (ii) If a copper sheet is inserted in the gap between the coils, explain, how the brightness of the bulb would change. The figure given shows an arrangement by which current flows through the bulb (X) connected with coil B, when a.c. (i) It is based on the principle of “mutual induction”. (ii) Mention two factors on which the current produced in the coil B depends.(All India 2008) (i) State the underlying principle involved. passes through the coil A, the current starts flowing in the coil B. The circuit arrangement as shown in the diagram shows that when an a.c. Thus the average power dissipated per cycle in a capacitor is zero. circuit consisting of an inductor and a resistor. Thus, the average power dissipated per cycle in an inductor is zero.ĭerive an expression for the impedance of an a.c. The average power dissipated per cycle in the inductor is So we can write the instantaneous values of voltage and current as follows : circuit are given by i = 10 sin 314 tA and v = 50 sin \(\left(314 t+\frac\) radian. The instantaneous current and voltage of an a.c. What is the power dissipation in the circuit? (All India 2008) circuit are given by i = 10 sin 314 t A and v = 50 sin 314 t V. circuit are given by i = 10 sin 300 t A and V = 200 sin 300 t V. Important Questions for Class 12 Physics Chapter 7 Alternating Current Class 12 Important Questions Alternating Current Class 12 Important Questions Very Short Answer Type
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#Voltage and current to work done time pdf
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