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In regard to charges, when is there a repulsive force between two objects? What is an electric field and what are electric field lines? What effect does distance between two objects have on their electrical interaction? Whether or not charges will move in a material depends partly on how tightly _____ are held in the atoms of the material. What are the units of potential difference? What are the units of current? What are the units of resistance? Batteries produce which: current, resistance, potential difference? What is Ohm’s law? How does an incandescent bulb work? V= P= What is the potential difference across a resistor that dissipates 5.00 W of power and has a current of 5.0 A? What is the potential difference across a resistor that dissipates 25.00 W of power and has a current of 7.0 A? What is the potential difference across a resistor that dissipates 15.00 W of power and has a current of 8.0 A? What is the difference between an insulator and a conductor? What is the difference between a battery and a capacitor? Which will draw more current, 3 resistors of 5 ohms each that are connected in series or parallel? List insulators, superconductors, and semiconductors rank in order of least resistance to most resistance. What does a circuit breaker do? What happens to the overall resistance of a circuit when too many appliances are connected across a 120 V outlet? What is a superconductor and what happens to it as its temperature drops? Identify the different elements in this drawing and determine the current: Which bulb(s) will have current in this diagram? And identify which resistors are in series or parallel to each other. Does the wiring in your house use series or parallel circuits? When you walk on a rug in the winter and then touch a doorknob, you get a shock. Why? If a 100 W light bulb operates at a voltage of 120 V, what is the current in the bulb?