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Chapter check
A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure12.1. The current recorded in the ammeter will be
In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be Fig. 12.1 'NGEVTKEKV[ %*#26'4 Fig. 12.2
Electrical resistivity of a given metallic wire depends upon
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
Identify the circuit (Figure 12.3) in which the electrical components have been properly connected. Fig. 12.3
What is the maximum resistance which can be made using five resistors each of 1/5 Ω?
What is the minimum resistance which can be made using five resistors each of 1/5 Ω?
The proper representation of series combination of cells (Figure 12.4) obtaining maximum potential is
Which of the following represents voltage?
A cylindrical conductor of length l and uniform area of cross- section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure.12.5). Which of the following is true?
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
The resistivity does not change if
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have
Unit of electric power may also be expressed as
