Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

the following electric items are used daily in a house:i tv of 100 w for 2 hours,i fridge of 120 w for 24 hours,3 fluoresent tubes of 40 w for 4 hours,2 bulbs of 60 w each for 2 hours and 1 iron of 1000 w for half an hour.what is the bill for 1 month of power @3.00 per unit
Asked by deepa1122 | 31 May, 2015, 04:55: PM
answered-by-expert Expert Answer
begin mathsize 14px style Given space that colon bold For bold space bold television colon Power comma space straight P space equals space 100 space straight W Time comma space straight t space equals 2 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 100 space straight W cross times 2 space straight h equals 200 space Wh space equals 0.2 kWh bold For bold space bold Fridge bold colon Power comma space straight P space equals space 120 space straight W Time comma space straight t space equals 24 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 120 space straight W cross times 24 space straight h equals 2880 space Wh space equals 2.9 kWh bold For bold space bold fluorescent bold space bold tubes bold colon Power comma space straight P space equals space 40 space straight W Time comma space straight t space equals 4 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 40 space straight W cross times 4 space straight h equals 160 space Wh space equals 0.16 kWh For space three space tubes comma space the space electrical space energy space consumed space equals 3 cross times 0.16 space kWh equals 0.48 space kWh bold For bold space bold bulbs bold colon Power comma space straight P space equals space 60 space straight W Time comma space straight t space equals 2 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 60 space straight W cross times 2 space straight h equals 120 space Wh space equals 0.12 kWh For space two space bulbs comma space the space electrical space energy space consumed space equals 2 cross times 0.12 space kWh equals 0.24 space kWh bold For bold space bold Iron bold colon Power comma space straight P space equals space 1000 space straight W Time comma space straight t space equals 0.5 space hrs Electrical space energy space consumed space equals space straight P cross times straight t equals 1000 space straight W cross times 0.5 space straight h equals 500 space Wh space equals 0.5 kWh Total space energy space consumed space equals 0.2 space kWh space plus 2.9 kWh space plus 0.48 space kWh space plus 0.24 space kWh space plus 0.5 space kWh equals 4.32 space kWh For space one space month space total space energy space consumed space equals 4.32 cross times 30 equals 129.6 space kWh Total space cost space equals 129.6 cross times 3.00 space equals 388.8 space Rs end style
Answered by Jyothi Nair | 01 Jun, 2015, 09:37: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
write ohm's law for electric circuit. Also write the necessary formula for this .
Asked by khajannirwan | 27 Feb, 2024, 10:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
find Req
question image
Asked by sakshikatewa0 | 08 Feb, 2024, 12:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Will a current carrying conductor produce an electric field?
Asked by saanviyadla | 24 Jan, 2024, 07:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
resistivity
Asked by kamalaranjanmohantymohanty5 | 06 Jan, 2024, 10:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
find the new resistance of wire length l area of cross section A if it is folded 4 times
Asked by nandhikasugumar | 05 Oct, 2023, 04:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
finding the net resistance  
question image
Asked by daniya062008 | 02 Oct, 2023, 08:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
the resistance of a wire of 0.01 cm radius is 10 ohm.if the resistivity of the material of the wire is 50*10^-8 ohm meter find the length of the wire
Asked by prassanna.j | 03 Sep, 2023, 12:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Nichrome wire of length L and radius R has resistance 10 ohm.How would the resistance of the wire change when: only diameter of the wire is doubled?Justify 
Asked by prassanna.j | 03 Sep, 2023, 12:21: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value.State the change that will occur in the current through it.
Asked by prassanna.j | 03 Sep, 2023, 12:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
A given length of a wire is doubled of itself and this process is repeated once again.By what factor does the resistance of the wire changes?
Asked by prassanna.j | 03 Sep, 2023, 12:11: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×