Advertisements
Advertisements
Question
Advertisements
Solution
We know that, P =VI
I = `"P"/"V" = 40/220` = 0.11 A
APPEARS IN
RELATED QUESTIONS
What is the unit of electric current?
A given wire of resistance 1 Ω is stretched to double its length. What will be its new resistance?
Complete the following table. The first answer has been given as an example
| Quantity | Unit |
|
(a) Electrical potential Volt ( b) Resistance ( c) Power ( d) Energy ( e) Resistivity |
Volt ........ .......... ............ .............. |
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
Fig . shows the core of a transformer and i ts input and output connections
State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).
What is meant by internal resistance of a cell?
State the condition when it is advantageous to connect cells in parallel.
Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
