Which appliance uses more energy?

-- the CD player . . . . .  3,924,000 joules

-- the blender . . . . .  36,000 joules

-- the hair dryer . . . . .  270,000 joules

-- the computer . . . . .  7,200,000 joules

The computer is the big loser, mainly because it was left turned on for so long.

The computer uses more energy.

Explanation:

We know that the power of an electrical appliance is given by :

E is the energy of the appliance

t is the time taken

For CD player :

Power = 30 watts

Time, t = 3 hours = 10800 s

E = 324000 Joules

or E = 324 kJ

For blender :

Power = 300 watts

Time, t = 2 hours = 120 s

E = 36000 Joules

or E = 36 kJ

For hair dryer:

Power = 1500 watts

Time, t = 3 minutes = 180 s

E = 270000 Joules

or E = 270 kJ

For computer:

Power = 200 watts

Time, t = 10 hours= 36000 s

E = 7200000 Joules

or E = 7200 kJ

So, the computer uses more energy i.e. 7200 kJ. Hence, the correct option is (d).

i'm only doing this for the points : (

explanation:

i'm only doing this the points

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!