Which of the following is a situation in which you might need a 1:1 transformer? O You want to step up the voltage but not the current O You want to step up the current but not the voltage O You want to fool the power company into giving you free electricity O You want to use one circuit to control another circuit that is electrically isolated from it

4) The most basic DC circuit consists of a battery (direct current source) and a resistor connected with conducting wires. Draw such a circuit for a 10V battery and a 500 resistor. Indicate the direction of current on your diagram and find the current magnitude in this circuit.

A 115-W light bulb operates on an effective ac voltage of 110 V. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.  What is the effective current through the light bulb?

Which of the following options correctly describes a transformer? A) a device that converts electrical energy into mechanical energy B) a device that converts mechanical energy into electrical energy C) a device that converts AC voltage to DC voltage D) a device that uses electromagnetic induction to transfer electrical energy from one circuit to another circuit.