Physics
The diagram alongside shows three resistors connected across a cell of e.m.f. 1.8 V and internal resistance r. Calculate:
(i) Current through 3 Ω resistor.
(ii) The internal resistance r.
Related Questions
(i) What are superconductors?
(ii) Calculate the current drawn by an appliance rated 110 W, 220 V when connected across 220 V supply.
(iii) Name a substance whose resistance decreases with the increase in temperature.
The diagram below shows the change of phases of a substance on a temperature vs time graph on heating the substance at a constant rate.
(i) Why is the slope of CD less than slope of AB?
(ii) What is the boiling and melting point of the substance?
The diagram below shows the core of a transformer and it's input and output connections
(i) State the material used for the core.
(ii) Copy and complete the diagram of the transformer by drawing input and output coils.
(i) Define heat capacity of a substance.
(ii) Write the SI unit of heat capacity.
(iii) What is the relationship between heat capacity and specific heat capacity of a substance?