The transformer on a model train set steps down the voltage from 120 Volts to 9.0 Volts. If the number of turns on the secondary coil is 30, what is the number of turns on the primary coil?

Q: An electric water heater uses 13 amperes of current when plugged into a 110-volt outlet. How much…

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Q: How much current is entering a circuit junction if the currents leaving the junction are 2 mA, 10 mA…

A: Given : Currents leaving the junction are : I1 = 2 mA I2 = 10 mA I3 = 5.8 mA

Q: A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is…

A: Given  Voltage V=110 V Current I=5.5 A

Q: A transformer is designed to step down the 220 V. line voltage to 31 V. If there are 1115 turns on…

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Q: A transformer with a 120 V input voltage has 2000 turns of wire on the input coil and 197 turns of…

A: The expression for the output voltage is,

Q: If a circuit has a resistance of 20 ohms and a current of 18 A, what is the voltage ?

A: The answer is below

Q: What is the total circuit resistance when resistive elements of 5, 10, 15, and 20 Ω are connected in…

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Q: Three 20-Ohm light bulbs are wired in parallel. If they are connected to a 10 V potential…

A: Resistance, R = 20 Ω (three in parallel)  Voltage, V = 10 V  Current, I = ?

Q: What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25…

A: given that  voltage = 120 volt resistance = 25 ohms according to ohms law  V= IR

Q: How much heat will be released in the winding of an electric motor in 25 minutes if its active…

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Q: What is the speed of a wave that has a wavelength of 2 m and a frequency of 6 Hz?

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Q: A light bulb has 20 ohms of resistance, and it consumes 50 W of power. How much current flows…

A: Resistance (R) = 20 ohm  Power (P) = 50 W

Q: A clown in a circus swings back and forth on a long rope. If the clown makes 35 complete swings in…

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Q: The voltage in an electrical circuit is 120 volt. Its resistance is 50 ohms. What is the current in…

A: Resistance of the  circuit =50 ohm Voltage across resistance =120 volts

Q: How much power is used by a contact lens heating unit that draws 0.04 A of current from a 194 V…

A: Given data:  Current (I) = 0.04 A Voltage (V) = 194 V Required: Power (P)

Q: What is the current (in amperes) drawn by an 840 W toaster attached to a 120 V outlet?

A: Given that            The power of the toaster is (P) = 840W            The voltage (V) = 120V We…

Q: How much current is “drawn” by a 75 W lightbulb connected to a 120 V outlet?

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Q: A kilogram of water goes from 90 degrees Celsius to 10 degrees Celsius in a period of 2 hours. If…

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Q: An electric generator produces 200 kW of power and delivers the electricity at 6,500-V. How much…

A: Power is the product of current and voltage.  Calculate the current corresponding to both the…

Q: What is the total resistance when 10 resistors are put in parallel if each of them individually has…

A: When 10 resistors of equal resistance are put in parallel, 1Req=1R+1R+.....+1R10times1Req=10RReq=R10

Q: if the current passes R1 is 25mA and the voltage at R2 is 25 V, what is the value of R2 ?

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Q: How much current is drawn from a circuit that has a resistor of 100 ohms if powered by a battery…

A: The voltage in a resistance circuit is given by V = iR, where V = the voltage i = the current in the…

Q: What is the current in a 40-watt bulb when it is connected to a 220-V outlet?

A: The power input required in a circuit is defined as the product of the voltage drop across the…

Q: What is the speed of a wave with frequency 100 hz and wavelength of 2 m?

A: GivenFrequency f = 100HzWavelength λ = 2m

Q: If the coils of a heater have a resistance of 12 ohm, how much current does it draw when plugged…

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Q: An electric water heater consumes 5.63 kW for 2.85 h per day. What is the cost (in dollars per year)…

A: Given: The heater consumption of electricity is 5.63 kW for 2.85 h per day. The cost of electricity…

Q: A transformer is designed to step down the 220 V. line voltage to 21 V. If there are 1,514 turns on…

A: The input voltage Vi= 220 V The number of turns in input windings Ni=1514 turns The output voltage…

Q: What is the equivalent resistance of a 250 Ohm resistor and 500 Ohm resistor connected in series?

A: Given: The first resistance is R1=250 Ω. The second resistance is R2=500 Ω. The expression for…

Q: What current will be taken by a 1100 W appliance if the supply voltage is 260 V ?

A: Given data :                   Power  =  P                 Voltage  =  V      To find :…

Q: A 10-ohm resistor has a constant current. If 1,200 C of charge flow through it in 4 minutes what is…

A: Given data:  Charge (q) = 1200 C Time (t) = 4 min = 240 seconds Required: Current (I)

Q: How many milliamperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?

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Q: How many cells, each one having an open circuit emf of 4.5 V and an internal resistance of 0.5 ohms,…

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Q: What is the power dissipated in a circuit if there is 3.0 N of resistance and there is 5.0 A of…

A: Answer             C) 75W solution We know that The power dissipated in the circuit is P= I2R Here I…

Q: What is the current flowing in the coil when the applied voltage in a motor resistance of 3.4Ω is…

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Q: What is the resistance of a bulb if the current in it is 1.25 A when a 4 V voltage supply is…

A: It is given that, I=1.25 AV=4 V The resistance in bulb, using ohm's law is, V=IRR=VI=41.25=3.2 Ω

Q: How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of…

A: Given data:  Current (I) = 10 A Resistance (R) = 5 Ω Required: Voltage (V)

Q: If the potential difference across a length of wire is 3V and the resistance is 5Ω.…

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Q: An electric clothes dryer is rated at 3,400 W. How much energy does it use in 30 min?

A: power of electric cloth dryer (P) = 3400 W time (t) = 30 min

Q: What is the current, in mA, of a 3 kilo-Ohm resistor hooked up to a 120 V voltage source?

A: Given,

Q: What is the charge of an atom with 16 protons and 18 electrons?

A: We know that charge of 1 proton is 1.6022 x 10-19 coulomb                     charge of  1 electron…

Q: What is the primary voltage of a transformer if the ratio is 20:1 and the secondary voltage is 240…

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Q: If a 120-ohm resistor is in parallel with a 60-ohm resistor and a 9-V battery what is the total…

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Q: The current in an electric lamp is 5 amperes. What quantity of electricity flows towards the…

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Q: A transformer is designed to step down the 220 V. line voltage to 16 V. If there are 1,067 turns on…

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Q: The voltage V in volts of an electrical circuit is V = IR, where R is the resistance in ohms and I…

A: The product rule will be, ddtIR=IdRdt+RdIdt

Q: If a 2000.0 ohm resistor has a current of 1.5 Amps going through it, how much power does it turn…

A: The expression for the power is,

Q: When current is 7.07 and resistance is 3.15, what is the voltage in the system?

A: