1. You measure the current in a complex circuit by putting an ammeter in series
ID: 2091430 • Letter: 1
Question
1. You measure the current in a complex circuit by putting an ammeter in series with the power supply, whose potential difference is known. Now, calculat ethe total resistance of the circuit, using Ohm's law. Due to small resistance of the ammeter your calculated value for the total resistance will be slightly larger than the actual current or slightly smaller than the actual current? 2. A large fraction of your monthly electric bill pays for running your refrigerator. This tells you your refrigerator has a very large resistance/ very small resistance. 3. A fuse consists of a piece of metal with low melting point. IF the current in the circuit rises too high, the metal heats up, melts, and breaks the circuit. Suppose you want to install a 30A fuse in your house circuit. Where would you put a fuse so that the TOTAL current in the house never exceeds 30A? Be very specific 4. Seven resistors are connected in parallel to a power supply. If another resistor is added to the circuit in parallel: a) The current in each resistor a)increases b)decrease c)remain the same b) The current through the power supply branch will a)increase, b) decrease c) remain the sameExplanation / Answer
1) slightly smaller
2) small resistance
3) it should be designed such that the current in only that circuit or branch does not exceed 30A
4) c) remains same
a) increases
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