Advertisements
Advertisements
प्रश्न
Electrical appliances have voltage and power ratings as listed below. Which
has the larger working resistance?
| Appliances | Voltage (V) | Power (W) |
| (a) Washing machine | 250 | 3000 |
| ( b) Television | 240 | 160 |
| (c)240 | 240 | 1500 |
| ( d) Hair curler | 250 | 20 |
| ( e) Car head lamp | 12 | 36 |
Advertisements
उत्तर
| Appliances | Voltage (V) | Power (W) | Resistance (R in 0 =V2/P) |
| (a) Washing machine | 250 | 3000 | 20.8 |
| ( b) Television | 240 | 160 | 360 |
| (c)240 | 240 | 1500 | 38.4 |
| ( d) Hair curler | 250 | 20 | 3125 |
| ( e) Car head lamp | 12 | 36 | 4 |
Therefore, hair curier has the largest working resistance
APPEARS IN
संबंधित प्रश्न
What is the current in a circuit if the charge passing each point is 20 C in 40 s?
Calculate the equivalent resistance between A and B in the adjacent diagram.
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
Tick (✓) the correct choice among the following :
(a) A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig . The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.
Tick (✓) the correct choice among the following :
There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Answer the following question.
What is the function of a galvanometer in a circuit?
Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
In current electricity, a positive charge refers to ______.
