A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is


Asked by maham237 @ in Physics viewed by 1174 People

Answered by maham237 @



Answer:

2.25\cdot 10^5 J

Explanation:

First of all, we have to find the power used by the hair dryer, which is given by

P=\frac{V^2}{R}

where

V = 120 V is the voltage

R=9.6 \Omega is the resistance of the hair dryer

Substituting,

P=\frac{(120 V)^2}{9.6 \Omega}=1500 W

Now we can find the total electrical energy used, given by

E=Pt

where P is the power and

t = 2.5 min = 150 s is the time

Substituting,

E=(1500 W)(150 s)=2.25\cdot 10^5 J


Similar Questions

The electrical resistance in ohms of a certain thermometer

Asked by admin @ in Physics viewed by 257 persons

The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law: R = Ro [1 + α (T – To)] The resistance is 101.6 …

230 volt hair dryer

Asked by maham237 @ in Engineering viewed by 614 persons

A hair dryer has a switch that allows it to be used in the US (where the AC voltage is 120 V) and in Europe (where the AC voltage is …

Is used to measure electric resistance in a circuit

Asked by admin @ in Physics viewed by 317 persons

_____ is used to measure electric resistance in a circuit. a)voltmeterb)galvanometer3)ammeter4)ohm meter

An electric iron of resistance 20 ohm

Asked by admin @ in Science viewed by 342 persons

an electric iron of resistance 20 ohm takes a current of 5A. calculate the heat developed in 30 seconds

A machine used for converting mechanical energy into electrical energy

Asked by admin @ in English viewed by 331 persons

A _____ (OMANYD) is a machine used for converting mechanical energy into electrical energy.

What time will it be in 15 minutes from now

Asked by admin @ in Mathematics viewed by 259 persons

Suppose the time now 3:15 pm. fifty minutes from now tbe time will be

How does a generator convert mechanical energy to electrical energy

Asked by admin @ in Biology viewed by 264 persons

What is the difference between a generator and a motor? Question 18 options: A generator converts mechanical energy into electrical energy and a motor converts electrical energy into mechanical energy. …

Rani spends time with her aunt on weekends rewrite using one of the adverb

Asked by krish080 @ in English viewed by 394 persons

How to find total distance on a position time graph

Asked by admin @ in Geography viewed by 313 persons

1. What is the equation for time when using a position-time graph? 2. What is the equation for displacement when using a velocity-time graph?

Name the main functional areas of operation used in business

Asked by admin @ in Business viewed by 361 persons

Identify the three major functional areas of an organization’s operations and describe how they interrelate.

What time frame should be used to administer intravenous epinephrine

Asked by admin @ in Health viewed by 288 persons

What time frame should be used to administer intravenous epinephrine?

A wire of resistance 5 ohm is bent

Asked by admin @ in Physics viewed by 348 persons

a wire of resistance 5 ohm is bent in the the form of a circle . what is the effective resistance between the two ends of any diameter of the …

An lcr series circuit with 100 ohm resistance

Asked by admin @ in Physics viewed by 309 persons

A LCR series circuit with 100 ohm resistance is connected to an ac source of 200 V and angular frequency of 300 rad/s. When only the capacitance is removed, the …

Most viewed questions in Physics


Jeevandeep health and physical education std 10 answers pdf

Asked by admin @ in Physics viewed by 11020 persons


Hc verma physics class 9 solutions of describing motion

Asked by admin @ in Physics viewed by 2640 persons


How to leave nightmare land answer key

Asked by maham237 @ in Physics viewed by 1562 persons



Base area and stability of some objects with different shapes

Asked by admin @ in Physics viewed by 1498 persons


Which of the following statements about safe lifting are correct

Asked by admin @ in Physics viewed by 1490 persons


Porous water-absorbing mass of fibers

Asked by wiki @ in Physics viewed by 1458 persons



Absorption of water by filter paper is due to

Asked by admin @ in Physics viewed by 1407 persons


A composite wire of uniform diameter 3mm

Asked by admin @ in Physics viewed by 1372 persons


At a distance l 400m from the traffic light

Asked by admin @ in Physics viewed by 1288 persons



A rocket of mass m is launched straight up with thrust f⃗ thrust.

Asked by maham237 @ in Physics viewed by 1288 persons


Mind map for light reflection and refraction class 10

Asked by admin @ in Physics viewed by 1122 persons



A thief runs at a speed of 10m s

Asked by admin @ in Physics viewed by 1069 persons


A 5.8 x 10 4 watt elevator motor can lift

Asked by maham237 @ in Physics viewed by 1055 persons