Advertisements
Advertisements
प्रश्न
Distinguish between an open and a closed circuit.
Advertisements
उत्तर
An open circuit is an incomplete circuit and current does not flow through it, while a closed circuit is a complete circuit and current flows through it.
APPEARS IN
संबंधित प्रश्न
Fill in the folloing blank with suitable words:
Current is measured in ............... using an ............... placed in ............... in a circuit.
Write down the formula which relates electric charge, time and electric current
Find the potential difference required to pass a current of 0.2 A in a wire of resistance 20Ω
State two differences between the e.m.f and terminal voltage of a cell.
Fig. shows a 3 pin plug with the cover removed. The electric cable
connected to the plug contains 3 wires with colour coded insulation namely brown, blue and green.

- Identify each of the colour coded wires by stating to which of the
terminals A, B or C in the diagram they should be connected. - Identify the terminal through which no current passes in normal
circumstances. - What is the purpose of the earthed wire connected to an electric
appliance like an electric heater? Describe how it works.
What is the function of a step-up transformer?
Tick (✓) the correct choice among the following :
Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Electric current passes through a metallic conductor due to the movement of ______.
