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- A short circuit in a 120-V appliance cord has a0.500- resistance. Calculate the temperature rise of the2.00 g of surrounding materials, assuming their specific heat capacity is 0.200cal/gC and that it takes 0.0500 sfor a circuit breaker to interrupt the current. Is this likely to be damaging?A 0.50-W, 220- resistor carries the maximumcurrent possible without damaging the resistor. If the current were reduced to half the value, what would be the power consumed?Why do transmission lines operate at very hig1 voltages while household circuits operate at fairly small voltages?
- Check Your Understanding Verify that /V and e0/d have the same physical units.Check Your Understanding In considering the following schematic and the power supplied and consumed by a circuit, will a voltage source always provide power to the circuit, or can a voltage source consume power?A certain electronic device needs to be protected againstsudden surges in current. In particular, after the power isturned on, the current should rise no more than 7.5 mA inthe first The device has resistance and isdesigned to operate at 55 mA. How would you protect thisdevice?
- A 15.5 V battery is connected to a 102 Ωresistor.Neglecting the internal resistance of thebattery, calculate the power dissipated in theresistor.Answer in units of W.How many different resistance valuescan be created by combining three unequal resistors? (Don’t count possibilities in which not allthe resistors are used, i.e., ones in which there iszero current in one or more of them.)A short circuit in a 120-V appliance cord has a 0.500- Ω resistance. Calculate the temperature rise of the 2.00 g of surrounding materials, assuming their specific heat capacity is 0.200 cal/g⋅ºC and that it takes 0.0500 s for a circuitbreaker to interrupt the current. Is this likely to be damaging?
- Each of the resistors in thefollowing circuit has aresistance of 30 Ohms. What isthe equivalent resistance of thiscircuit, and the total currentflowing through the circuit, ifthe battery has a potentialdifference of 8 Volts?What could happen to the drift velocity of the electrons in awire and to the current in the wire if the electrons could movethrough it freely without resistance?A set of decorative outdoor lights is left on for12.0 h. The lights draw a current of 2.00 A,and run on 120.0 V. How much energy willthey consume in this time?