RL circuit

Hi. Can someone please show me how to do this problem? "How long does it take for the current in an RL circuit with R = 130 ohms and L = 63 mH to reach half its final value?" Thank you.

RL circuit

Hi. Can someone please walk me through how to do this problem? "Consider an RL circuit in which there's a 9.0 V battery, R = 5.5 ohms, L is unknown, and there's a switch that can be open or closed. When the switch is closed, the current in the circuit is observed to increase from 0 to 0.22 A in 0.15 seconds. (a) What is the i ...continues

energy stored in magnetic field

Hi. Can someone please show me how to do the following problem? "Given an RL circuit in which there's a 9.0 V battery, R = 5.5 ohms, L = 6.1 mH, and there's a switch that can be opened or closed, how much energy is stored in the inductor after the switch has been closed a long time?" Thank you.

transformers

Hi. Can someone please show me how to do the following problem? "A transformer with a turns ratio (secondary/primary) of 1:13 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger?" Thank you.

RC circuit

Hi. Can someone please walk me through how to do the following problem? "The capacitor in an RC circuit (R = 120 ohms, C = 45 micro-F) is initially charged. Find (a) the charge on the capacitor and (b) the current in the circuit one time constant after the circuit is connected to a 9.0-V battery." Thank you.

resistors

Hi. Can someone please walk me through how to do the following problem? "Two resistors are connected in series to a battery with an emf of 12 V. The voltage across the first resistor is 2.2 V and the current through the second resistor is 0.15 A. Find the resistance of teh two resistors." Thank you.

Resistors Networks

"Three resistors (R, 1/2R, 2R) are connected to a battery. (a) If the resistors are connected in series, which one has the greatest rate of energy dissipation? (b) Repeat part (a), this time assuming that the resistors are connected in parallel."

inductor/capacitor

Hi. Can someone please help me with this conceptual question? "An inductor and a capacitor are to be connected to a generator. Will the generator supply more current at a low frequency if the inductor and capacitor are connected in series or in parallel?" Thank you.

AC vs. DC

Hi. Can someone please help me with this conceptual question? "In considering an ac circuit consisting of a light bulb in series with an inductor, we know that the effect of the inductor is to cause the light bulb to shine less brightly. Would the same be true in a direct-current (dc) circuit? Explain." Thank you.

LC circuit, phase angle

Hi. Can someone please help me with this conceptual question? "An LC circuit is driven at a frequency higher than its resonance frequency. What can be said about the phase angle for this circuit?" Thank you.