Advertisements
Advertisements
Question
A simple electric circuit has a 30 V battery and a resistor ot 60 o. What will be the current in the circuit? The resistance of the oonnecting wires is negligible.
Advertisements
Solution
A/c to Ohm's law,
I = `"V"/"R"`
Here V = 30 volt and R = 60 Ω
`therefore "I" = 30/60 = 0.5` A
APPEARS IN
RELATED QUESTIONS
What determines the rate at which energy is delivered by a current?
Which particles are responsible for current in conductors?
Name two safety devices which are connected to the live wire of a household electric circuit
The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A.
What is the resistance of the lamp?
What is the power of the lamp?
The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction.

(i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.
What is the current I in the given circuit (Fig. )?

‘The current rating of a fuse is 5A’. Comment on this statement.
State two advantages of filling an inert gas in an evacuated electric filament lamp.
State relative advantages and disadvantages of ring system of wiring over the tree system.
An overhead tank of capacity 10 k litre is kept at the top of building 15 m high. Water falls in tank with speed 5`sqrt2` m/s. Water level is at a depth 5 m below ground. The tank is to be filled in `1/2` hr. If efficiency of pump is 67.5% electric power used is ______ W.
