The charger cord used to recharge a cell phone contains a transformer that reduces l20 V AC to 5 VAC. For each 1,000 turns in the input coil, how many turns are there in the output 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: The primary coil of a transformer with 954 turns carries an EMF of 2.2. If the secondary coil has…

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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: An electric heater plugs into a 120 V outlet and uses 1500 W of power. How much current does the…

A: Given: Voltage, V=120 V Power, P=1500 W To find: Current drawn by heater

Q: The generator at a power plant produces AC at 30,000 V. A transformer steps this up to 355,000 V for…

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Q: A furnace for an electric heating system is rated at 121 amperes and 27,500watts. What is the…

A: Given: The current is 121 A. The power is 27500 W.

Q: A step up transformer has 79 turns in the primary coil and 425 turns in secondary coil. The primary…

A: Given, Number of turns in the primary coil=79turns Number of coil in the secondary coil=425turns…

Q: A transformer with 1820 turns in its primary coil has to decrease the voltage from 5720 V to 220 V…

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Q: a transformer has 20 turns in its primary could and 500 turns in its secondary coil. if the primary…

A: calculation

Q: The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 4 V…

A: Given data The input voltage to the transformer is: V1  = 120 V The output voltage to the…

Q: A cell phone charger is rated for 0.4 amps. It takes 90 minutes to get a full charge. How much does…

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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: A hot water heater used 3.7 kilowatt for 1 of an hour. If electricity costs $0.29 per kilowatt-hour,…

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Q: A transformer with 1140 turns in its primary coil has to decrease the voltage from 4180 V to 220 V…

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Q: The transformer on a model train set steps down the voltage from 120 Volts to 9.0 Volts. If the…

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Q: A series DC motor has a resistance of 8 2 between its terminals. The motor runs at 1,393 rpm at 230…

A: Initial Resistance, R =  8 ohm Initial Round per minute, N1=1393 Voltage, V=230 V Initial Current,…

Q: A voltage of 12 volts across a lamp produces a current of 0.4 ampere. What is the filament…

A: Voltage(V),  current(I) and resistance(R) are related by the following formula, R = V/I

Q: How much energy is used to light a 45 Watt light bulb for 10 hours?

A: Given, P=45 Watt t = 10 Hours We know that, E = P*t   = (45 Watt) *(10 h)    = 45 Watt ((10 h) (60…

Q: A step-up transformer has 42 turns in primary coil and 439 turns in the secondary coil. The primary…

A: We know that  Vs/Vp = Ns/Np  Vs = NsVp/Np

Q: What is the ratio of the speed of one motor turning at 1,750 revolutions per minute to the speed of…

A: Speed of first motor = 1,750 rpmSpeed of second motor = 3,500 rpmRatio = ?

Q: The generator at a power plant produces AC at 21,000 V. A transformer steps this up to 375,000 V for…

A: The operation of transformer relies on the principle of electromagnetic induction. By wrapping wire…

Q: How much does it cost to light a 300-W lightbulb for 30 days if the cost of electricity is 7¢/kWh?

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Q: The transformer on a model train set steps down the voltage from 120 Volts to 9.0 Volts. If the…

A: Voltage of primary coil , Vp = 120 V Voltage of secondary coil , Vs = 9 V Number of turns on…

Q: The generator at a power plant produces AC at 28,000 V. A transformer steps this up to 305,000 V for…

A: This question will be solved by formula of Transformer ratio.i.e., VoVi=NoNi here Vo and Vi are…

Q: A transformer with primary 712 windings and 5,275 secondary windings has an input voltage of 101 AC.…

A: Np=712Ns=5275Vp=101 AC

Q: A transformer with primary 998 windings and 6,765 secondary windings has an input voltage of 123 AC.…

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Q: A light bulb with a resistance of 10 ohms is connected to a battery and emits 40 Watts of light.…

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Q: A transformer with primary 510 windings and 5,825 secondary windings has an input voltage of 137 AC.…

A: Given data: Number of primary windings, Np=510 Number of secondary windings, Ns=5825 Input voltage,…

Q: A transformer is designed to step down the 220 V. line voltage to 8 V. If there are 1.753 turns on…

A: Primary Voltage, Vp=220 V  Secondary Voltage, Vs=8 V Input coil turns, Np=1.753 Let Ns be the no of…

Q: A transformer with 915 primary windings and 7,780 secondary windings has an input voltage of 155 AC.…

A: Data Given ,  No. Of primary windings ( Np ) =915 No. Of secondary windings ( Ns ) = 7780  Input…

Q: A transformer is designed to change 120Volt into 14000 volt and there are 300 turns in the primary…

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Q: turns

A: A transformer transforms energy from the primary to the secondary coil through mutual induction in…

Q: A transformer is designed to step down the 220 V. Line voltage to 39 If there are 1,976 turns on the…

A: A transformer is an electrical device which transform or convert one voltage level to another. It…

Q: A transformer with 720 turns in its primary coil has to decrease the voltage from 5280 V to 220 V…

A: Given, The primary coil has 720 turns Voltage decrease from 5280 V to 220 V

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: The generator at a power plant produces AC at 22,000 V. A transformer steps this up to 355,000 V for…

A: Given data: Voltage of primary coil (Vp) = 22,000 V Voltage of secondary coil (Vs) = 355,000 V…

Q: A transformer has a voltage input of 120 V and an output of 1500 V. If the primary coil has 200…

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Q: A circuit driven by a 15-V battery contains a 6-Ohm light bulb. If the circuit runs for 45 minutes,…

A: SOlution: Given that V = 15 V R = 6 Ohm T = 45 minutes

Q: A step-down transformer, with 75 turns in the primary coil, is connected to a 120-V line.…

A: Using the relation, NsNp=VsVp

Q: A lamp consumes 1200 J of electrical energy in 10 seconds. what is it's Power?

A: Introduction :  In this question we are provided with value of time and work.with these data we have…

Q: transformer is designed to step down the 220 V. line voltage to 47 V. If there are 1,183 turns on…

A: Transformers works on phenomenon of mutual induction

Q: The generator at a power plant produced AC at 25,000 V. A transformer steps this up to to 305,000 V…

A: V1 = 25000 V  V2 = 305000 V  Turns on the input coil , n1 = 2050  To find = turns on the output coil…

Q: Suppose you use 57 kWh (kilowatt hours) of electricity at $0.35 per kWH, 91 kWh at $0.26 per kWh,…

A: We use 57 kWh of electricity at 0.35$ per kWh So cost of 57 kWh of electricity is 57×0.35$=19.95$ We…

Q: The generator at a power plant produces AC at 19,000 V.  A transformer steps this up to 315,000 V…

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