A lightbulb is rated at 75 W when connected to 120 V. (a) What current flows through the bulb in this case?  A (b) What is the bulb's resistance?  Ω (c) What would be the current in the bulb if it were connected to 76 V,  assuming the resistance stays the same?

Q: Thermal energy is produced in a resistor at a rate of 85.3 W when the current is 3.99 A. What is the…

A: Given E = 85.3 W         ( Thermal Energy ) I = 3.99 A.          ( current  ) formula used   E = I2R…

Q: Thermal energy is produced in a resistor at a rate of 108 W when the current is 3.74 A. What is the…

A: Electric power Electric Power is the rate that energy is supplied by a source or dissipated by a…

Q: A copper wire of 10 Q and length L. At what point along its length must the wire be cut out so that…

A: The resistance of the wire is directly proportional to the length of the conductor.

Q: Person with body resistance between his hands of 10.0 kΩ accidentally grasps the terminals of a…

A:

Q: A certain lightbulb has a tungsten filament with a resistance of 21.7 2 when at 20.0°C and 144 2…

A:

Q: How much electrical energy is transferred to thermal energy in 2.50 hrs by an electrical resistance…

A:

Q: You need a 45 W resistor, but the stockroom has only 20 W and 50 W How can the desired resistance be…

A:

Q: How much power does a 60 W, 120 V incandescent light bulb dissipate on a voltage of 115 V? Neglect…

A: we use the given relations P=60=V2R=1202R⇒R=120260=240 Ohms

Q: A rechargeable flashlight battery is capable of delivering 62 mA for about 9 h. How much charge can…

A: We know that  Current= rate of change of charge I= dQ/dt Given that I= 0.062 A time= 9 hour =…

Q: On three separate instances you connect each lightbulb to a battery with an emf of 12.00 V and an…

A: Given quantities: emf of the battery (V) = 12 Volts internal resistance (r) = 0.5 ohm current…

Q: The potential difference across a resting neuron in thehuman body is about 75.0 mV and carries a…

A: Given:Potential difference across the resting neuron = 75 mVCurrent in the neuron = 0.200 mA

Q: Given that V= J/A-s and 1 Kwh = 3.6 x106 J, what does it cost to operate a window-type air…

A: Given V = J/A-s 1 Kwh = 3.6 x 106 J Current = 10 Amp Voltage = 110 V

Q: Consider a cylindrical ohmic wire with the following dimensions: length = 10.0 m, radius = 0.05 m.…

A:

Q: How much electrical energy is transferred to thermal energy in 2.00 hrs by an electrical resistance…

A: The potential difference,

Q: Calculate the effective resistance (in kΩ) of a pocket calculator that has a 2.15 V battery and…

A: According to Ohm's lawV=IRR=VIHereV=voltageI=currentR=Resistance

Q: A student examining a flashlight observes that it uses a traditional incandescent light bulb. The…

A: We know, P=VII=PV

Q: A resistor made of Nichrome wire is used in an application where its resistance cannot change more…

A:

Q: resistance of an electric heater is 45 Ω when connected to 120 V. How much energy does it use…

A:

Q: Although caution must be used in applying ρ = ρ0(1 + αΔT) and R = R0(1 + αΔT) for temperature…

A: The original resistance of the filament,   The temperature change,

Q: An idealized ammeter and voltmeter are comnected to the circuit. When switch S in Figure is open,…

A:

Q: A galvanometer whose resistance is 50 Q has 25 divisions in it. When a current of 4 x 104A passes…

A:

Q: The Iceberg Kid, infamous for imposing a deep freeze on whoever disagrees with him, discovers that…

A: Given., Thermal energy is generated W = 177 J For time  t = 7.69 Voltage V = 12 V    We know the…

Q: How much electrical energy (in kilojoules) is transferred to thermal energy in 1.62 hours by an…

A:

Q: You measure the power delivered by a battery to be 6.00 W when it is connected in series with two…

A:

Q: An electronic device designed to operate at any temperature in the range from –10.0ºC to 55.0ºC…

A: Pure carbon resistors have temperature coefficient of resistivity of α=-0.5×10-3 /Co Given…

Q: If the 0.100-mm diameter tungsten filament in a light bulb is to have a resistance of 0.200 Ω at…

A: Given - Diameter of tungsten filament ,d = 0.100 mm =0.100 x 10-3 m  Resistance of tungsten…

Q: A copper wire has a resistance of 0.500 Ω at 20.0oC ,and an iron wire has a resistance of 0.525 Ω at…

A: Given:- Copper wire resistance Rc = 0.5 ohm at 20 degrees. Iron wire resistance Ri = 0.525 ohm To…

Q: How much electrical energy is transferred to thermal energy in 2.50 hrs by an electrical |…

A: Let V be the potential across the electrical resistance R. Write the power formula and plug the…

Q: How much electrical energy is transferred to thermal energy in 2.00 h by an electrical resistance of…

A:

Q: Two 75 W (120 V) lightbulbs are wired in series, then the combination is connected to a 120 V…

A:

Q: What resistance, R, should be placed in series with the galvanometer, G, if it is to show a full…

A:

Q: A 50-watt lightbulb and a 100-watt lightbulb are each operated at 100 volts. Compared to the…

A: Given data:  Power of first lightbulb (P1) = 50 W P2 = 100 W Voltage (V) = 100 V Required:…

Q: How much electrical energy is transferred to thermal energy in 2.50 hrs by an electrical resistance…

A:

Q: How much electrical energy is converted to thermal energy in 2.00 hrs by an electrical resistance of…

A: The expression for the electrical energy is,

Q: A high tension (HT) supply of, say, 6 kV must have a very large internal resistance. Why?

A: Given:  V = 6 kV

Q: In the network shown, Find the current I and the power supplied by the voltage source, for V = 7 V.…

A: Here given the circuit with resistance 20 kΩ. We have to calculate the current and power of the…

Q: A coil of copper wire has a resistance of 62 Ω at room temperature of 24 °C. What will be its…

A:

Q: An electric lamp whose resistance, when in use, is 2 Q is connected to the terminals of a dry cell…

A: Write the variable with the given values.

Q: Power P0 = I0 ∆V0 is delivered to a resistor of resistance R0.If the resistance is doubled (Rnew =…

A: Given,

Q: Four identical batteries, each with an internal resistance Rw = 1 Ω and of unknown strength the…

A: 37.5 W

Q: (d) Find the rate at which chemical energy is stored in battery 1. (Note: Do not include power…

A: D. Answer Given voltage of battery , V= 6V Current flowing , I=0.72 A

Q: Lightbulbs are typically rated by their power dissipation when operated at a given voltage. Which of…

A: For solving resistances of light bulbs use power and voltage in below formula R=V2P (a)  P=0.8…

Q: Batteries are rated in terms of ampere - hours (A ⋅ h). For example,a battery that can deliver a…

A: Write the expression for power.

Q: The Iceberg Kid, infamous for imposing a deep freeze on whoever disagrees with him, discovers that…

A: Given: The thermal energy is 185 J. The time interval is 6.19 s. The operating voltage is 12.0 V.

Q: If a battery is rated at 60.0 A · h, how much total charge can it deliver before it goes “dead”?

A: Given data The rating of the battery is: I x t = 60 A.h                                   The…

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.