'. An electric current of 15 A is flowing through an electric fan. If the potential difference between two terminals of electric fan is 240 V, what will be resistance?
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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?Check Your Understanding The current density is proportional to the current and inversely proportional to the area. If the current density in a conducting wire increases, what would happen to the drift velocity of the charges in the wire?Can a wire carry a current and still be neutral-that is, have a total charge of zero? Explain.
- 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?The emf of a battery is E = 12 V . When thebattery delivers a current of 1 A to a load, thepotential difference between the terminals ofthe battery is 10 V volts.Find the internal resistance of the battery.Answer in units of Ω.Unreasonable ResultsTwo resistors, one having a resistance of 145 Ω , are connected in parallel to produce a total resistance of 150 Ω. What is the value of the second resistance?
- 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?Can a copper wire and an aluminum wire of the samelength have the same resistance? ExplainThe quantity of charge through a conductor is modeled as: q(t)=at4+bt+c --> I(t) = 4 a t^3 + b If a = 5.02C/s4, and b = -4.36C/s, and c = 1.75μC, then what is the current, in amperes, at t=1.45s?
- 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?Is it possible to connect a group of resistors of value R in such a waythat the equivalent resistance is less than R? If so, give a specificexampleAssuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: To accelerate from rest to 25.0 m/s in 1.00 min?