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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 5   FOR BOARD EXAMINATION

QUESTION NO. 13

Compare the power used in 2 ohm resistor in each of the circuit.

ANSWER NO. 13

(i) Potential difference  V = 6 V
Since 1 ohm and 2 ohm resistance are connected in series hence, equivalent resistance of the circuit
       R = 1 + 2 = 3 ohm
According to ohm's law - 
 V = IR,  I = V/R = 6/3 = 2A
Power used in 2 ohm resistance 
= P = IIR = 2X2X2 = 8 watt

 (ii) Since 1 ohm and 2 ohm resistors are connected in parallel.
The voltage across each component of a parallel circuit remains the same. Hence the voltage across 2 ohm resistor will be 4V.
 Power consumed by 2 ohm resistor is
 P = VV/R 
     = 4X4/2
     = 8 watt

QUESTION NO. 14

(a) Name and state the rule to determine the direction of force experienced by the a current carrying straight conductor placed in a uniform magnetic which is perpendicular to it. 

(b) Draw a labelled diagram of an electric motor.

ANSWER NO. 14

(a) The left hand rule that was given by Fleming.
 In this rule middle finger shows direction of the current. Fore finger shows direction of magnetic field and thumb shows direction of motion.

(b) 

PRINCIPLE  OF AN ELECTRIC MOTOR


An electric motor works on the principle that when a rectangular coil is placed in a magnetic field and a current passed through it, a force acts on the coil which rotes it continuously.

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