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- What direct current will produce the same amount of thermal energy, in a particular resistor, as an alternating current that has a maximum value of 2.60 A?A wire 2 m long moves perpendicular through a 0.08 T field at a speed of 7 m/s. What EMF is induced? Knowing Ohm's law and that the wire has a resistance of 0.50 ohms, what current flows?At the resonant frequency, calculate the current amplitude (I0) if ℰ₀ = 129 volts, R = 45 Ω, L = 4 Henries, C = 0.711 Farads.
- How much time does it take for the current in an RL circuit withR = 130 Ω and L = 68 mH to reach half its final value?A motor has an armature resistance of 3.65ohms. If it draws 8.20A when running at full speed and connected to a 120V line, how large is the back emf?Hydroelectric generators at Hoover Dam produce a maximum current of 8.00×103 A at 250 kV. (a) What is the power output? (b) The water that powers the generators enters and leaves the system at low speed (thus its kinetic energy does not change) but loses 160 m in altitude. How many cubic meters per second are needed, assuming 85.0% efficiency?
- How long would it take, following the removal of the battery, for the potential difference across the resistor in an RL circuit (with L = 2.00 H, R = 3.00 ohm) to decay to 10.0% of its initial value?Assuming a steady current flow through a switch, find the time required for a (a)20 C to flow if the current is 15 mA, (b) 12 μC to flow if the current is 30 ρA, and(c) 2.58 x 1015 electrons to flow if the current is – 64.2 nA.How much energy is stored in an inductor ?
- 0.2 H inductor and 146 ohm resistor are connected to a 12V battery. When will the current will reach 84% of its final value ??6.43 The current in an 80-mH inductor increases from 0to 60 mA. How much energy is stored in theinductor?..If magnetic coils are powered by AC, why don’t their contacts open and close 120 times per second?