n electrons flow through a cross-section of a conductor in time t. If the charge on an electron is e,
write an expression for the current in the conductor
In the electric circuit shown in the figure, label the parts A, B, C, D, E, and F. State the function of each part. Show in the diagram the direction of flow of current
Write symbols and state functions of each of the following components in an electric circuit
(iv) Ammeter, and
(a) Complete the circuit given in figure by inserting between the terminals A and C, an ammeter.
(b) In the diagram mark the polarity at the terminals of the ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit
Select conductors of electricity from the following: Copper wire, silk thread, pure water, acidulated water, human body, glass, mercury.
Distinguish between a closed circuit and an open circuit, with the use of a suitable labeled diagram.
A cell is used to:
(a) Measure current in a circuit
(b) Provide current in a circuit
(c) Limit current in a circuit
(d) Prevent current in a circuit
A current of 1.5A flows through a conductor for 2.0s. What amount of charge passes through the conductor
The figure below shows two conductors A and B. Their charges and potentials are given in the diagram. State the direction of (i) flow of electrons, and (ii) flow of current, when both the conductors are joined by a metal wire
How is the direction of flow of current between two charged conductors determined by their potentials
Explain the concept of electric potential difference in terms of work done in transferring\ the charge
How is the current flowing in a conductor changed if the resistance of the conductor is doubled keeping the potential difference across it the same?
State three factors on which the resistance of a wire depends. Explain how does the resistance depends on the factors stated by you.
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows
Current in a circuit flows:
(a) In the direction from high potential to low potential
(b) In the direction from low potential to high potential
(c) In direction of flow of electrons
(d) In any direction
On increasing the resistance in a circuit, the current in it:
(c) Remains unchanged
(d) Nothing can be said
In transferring 1.5 C charge through a wire, 9 J of work is needed. Find the potential difference across the wire
A cell of potential difference 12V is connected to a bulb. The resistance of the filament of bulb when it glows is 24ᘯ. Find the current drawn from the cell
A bulb draws the current 1.5A at 6.0V. Find the resistance of the filament of the bulb while glowing
Which of the following device is most efficient for lighting purpose:
LED, CFL, Fluorescent tube light, Electric bulb
Give an example to explain that the use of modern eco-friendly technologies is more efficient and less polluting
The most non-polluting and efficient lighting device is:
(c) Fluorescent light
(d) Electric bulb
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