concepts_ch4

# Conceptest 42b conceptest points p and q are

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Unformatted text preview: st 4.2b ConcepTest Points P and Q are connected to a Points Parallel Resistors II a) increases battery of fixed voltage. As more b) remains the same resistors R are added to the parallel c) decreases circuit, what happens to the total d) drops to zero current in the circuit? current ConcepTest 4.2b ConcepTest Parallel Resistors II Points P and Q are connected to a Points a) increases battery of fixed voltage. As more b) remains the same resistors R are added to the parallel c) decreases circuit, what happens to the total d) drops to zero current in the circuit? current As we add parallel resistors, the overall resistance of the circuit drops. Since V = resistance IR, and V is held constant by the battery, when resistance decreases, the current resistance must increase. must Follow-up: What happens to the current through each resistor? ConcepTest 4.3a ConcepTest Current flows through a Current Short Circuit a) all the current continues to flow through the bulb through connected across the b) half the current flows through the wire, the other half continues through the bulb bulb bulb, what happens? bulb, c) all the current flows through the wire lightbulb. If a wire is now d) none of the above none ConcepTest 4.3a Current flows through a Current Short Circuit a) all the current continues to flow through the bulb through connected across the b) half the current flows through the wire, the other half continues through the bulb bulb bulb, what happens? bulb, c) all the current flows through the wire lightbulb. If a wire is now d) none of the above none The current divides based on the ratio of the resistances. If one of the resistances is zero, then ALL of the zero ALL current will flow through that path. Follow-up: Doesn’t the wire have SOME resistance? ConcepTest 4.3b ConcepTest Two lightbulbs A and B are Two connected in series to a constant voltage source. When a wire is connected across B, bulb A will: across Short Circuit II a) glow brighter than before glow b) glow just the same as before glow c) glow dimmer than before glow d) go out completely e) explode ConcepTest 4.3b ConcepTest Two lightbulbs A and B are Two connect...
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