Choose the BEST answer to the following: If the current in the filament of a lamp is 3 A, the current in the connecting wire is (a) less than 3 A. (b) 3 A. (c) more than 3 A. (d) Not enough information to say.

Q: Choose the BEST answer to the following: As more lamps are connected in parallel in a circuit, the…

A: For the lamps connected in parallel, the voltage across each of the lamps is same whereas the…

Q: Why does the filament of a lightbulb glow while the connecting wires do not?

A: The filament of a bulb is made of a metal with quite high resistance high melting point like…

Q: Choose the BEST answer to the following: The metal detectors people walk through at airports operate…

A: A metal detector is a kind of electronic instrument which is used to locate metal objects in its…

Q: Why does current travel at 400,000V through the national grid?

A: To describe Why Current travels at 400,000 V through National grid

Q: "hat happens to the current in a circuit if a 1.5-volt attery is removed and is replaced by a 3-volt…

A: According to ohms law V= IR

Q: What is a magnetic field? What is its source?

A: Introduction :- Here we need to define the magnetic field and the source of it.

Q: Which of the lightbulbs, the 25-W bulb or the 60-W bulb , has the higher resistance? Which draws…

A: The power used in lightbulbs is calculated by using the formula P=VI=V2R=Et  , where V is the…

Q: A flashlight uses batteries that add up to 4.5 V and has a power output of 0.47 W.

A: Given :: Voltage, V = 4.5 V Output, P = 0.47 W

Q: State the relationship between power, resistance and current.

A: Let P, V, I, and R denote the electrical power, the voltage, the current, and the resistance of a…

Q: What is the general name of the substances having infinitely high electrical resistance?

A: For insulator, the value of resistance is very high.

Q: Choose the BEST answer to the following: A step-up transformer in an electrical circuit can step up…

A: A step-up transformer is a static device, which is used in electric circuits to increase the voltage…

Q: It is an electronic device that transforms an alternating current into direct current.

A: A Rectifier is a device that converts alternating current into direct current. The Rectifier is made…

Q: hat happens to the current in a circuit when the resistance increases? What happens to the current…

A: The Ohm’s law states that the potential difference in a circuit is directly proportional to the…

Q: Between current and voltage, which remains the same for a 10-Ω and a 20-Ω resistor in parallel in a…

A:

Q: What will happen in a world without electric field?

A: Answer:-  In a world without electric field. No current  Therefore supply water is Stop in pumping…

Q: What is the error in saying that electrons in a common battery-driven circuit travel at about the…

A:

Q: Who invented the light bulb, generator and other electrical devices?

A: The first working electric lamp was demonstrated by Humphry Davy in 1809.

Q: Choose the BEST answer to the following: When you brush your hair and scrape electrons from your…

A: When electrons are removed from an object, the object gets electron deficient. Electrons are…

Q: A toaster has a heating element of 15 Ω and is connected to a 120-V outlet. Show that the current…

A: Given:  Resistance, R = 15 ohm  Voltage, V = 120 V

Q: How much power is there in an electrical circuit of 5.73 Volts and carrying 56.9 Amps of current?

A: Answer :- Given :-  V = 5.73 V I = 56.9 Amp P =?  We know that              P =  V × I Where P is…

Q: Choose the BEST answer to the following: As more lamps are connected to a series circuit, the…

A: As the more lamps are connected in a series circuit the brightness of each lamp diminishes.Since the…

Q: In the phenomenon of superconductivity, what happens to electrical resistance at low temperatures?

A:

Q: Calculate the electrical power of a lamp that carries 2 amps of current at 120 volts.

A: the expression for power is

Q: In which of the circuits shown does a current exist to light the bulb?

A: Given:  Five circuits

Q: Give advantages and disadvantages of filament pyrometer.

A: Advantages of filament pyrometer are:

Q: Choose the BEST answer to the following: In a circuit of two lamps in parallel, if the current in…

A: Given that the two lamps are parallel and the current in one lamp is 2A.

Q: Show that operating a 100-W lamp continuously for 1 week when the power utility rate is 15¢/kWh…

A:

Q: What does an electric circuit mean?

A:

Q: How does the charge of one electron compare to that of another electron?

A:

Q: What is the total power used by a 4.5-A electric iron, a 0.9-A fan, and a 2.4-A refrigerator motor…

A: Given value--- i1 = 4.5 Amp. i2 = 0.9 Amp. i3 = 2.4 Amp. V = 120 V. We have to find--- total…

Q: An electron is happily moving along in a straight-line when it suddenly finds itself moving in…

A: Answer: Let us consider that the electron is moving in the left direction and current in the right…

Q: Why is the tungsten used almost exclusively for filament of electric lamps?

A: In most of the electric bulbs and lamps tungsten is used as filament. The main reason is high…

Q: Why does the light come on so quickly when switch is thrown?

A:

Q: A 4-W night-light is plugged into a 120-V circuit and operates continuously for 1 year. Find the…

A: Given:  Power,P = 4 W  voltage,V = 120 V  time = 1 year

Q: what actually causes the current?

A: Electric current is the flow of electric charge through a particular area per unit time. In an…