Question Library

From the diagram above, current X is

Using the circuit above as a guide, X is

Which of the following is better for measuring a very small resistance?

What is the electrolyte used in wet Leclanche cell

Assuming E\(_1\), E\(_2\), and E\(_3\), are equal, then the total e.m.f of the arrangement will be given by

The energy stored in a capacitor of capacitance 5μF is 40 J. Calculate the voltage applied across its terminals.

Calculate the quantity of charge flowing through a conductor if a current of 10 A passes through the conductor for 10 s.

What is the potential difference between X and Y in the diagram above if the battery is of negligible internal resistance?

Calculate the current in the 3 Ω resistor in Question 47.

A given wire of resistance 10 Ω has a length of 5 m and a cross-sectional area of 4.0 × 10\(^{-3}\) m\(^2\). Calculate the conductivity of the wire.

3a. (i) Measure and record the e.m.f of the accumulator provided. (ii) Connect the circuit as shown in the diagram. S is a standard resistor, and R is a resistance box. (iii) With R = 0 Ω, close the key K. Read and record the ammeter reading I. Evaluate I\(^{-1}\). (iv) Repeat the procedure for R = 1, 2, 3, 4, and 5 Ω. Tabulate your readings. (v) Plot a graph of R on the vertical axis and I\(^{-1}\) on the horizontal axis, starting both axes from the origin (0,0). (vi) Determine the slope s of the graph and find the intercept c on the vertical axis. (vii) State two precautions taken to ensure accurate results. [21 marks] bi. State two advantages of a lead-acid accumulator over a Leclanche cell. [2 marks] ii. A parallel combination of 3 Ω and 4 Ω resistors is connected in series with a resistor of 4 Ω and a battery of negligible internal resistance. Calculate the effective resistance in the circuit. [2 marks]

Electrolysis can be investigated using

If a sheet of an insulating material is inserted between the plates of an air capacitor, the capacitance will

A cell of internal resistance of 2\(\Omega\) supplies current through a resistor, X if the efficiency of the cell is 75%, find the value of X.

In electrolysis, when same quantity of electricity is passed through different electrolytes, mass of substances deposited is proportional to