Advertisements
Advertisements
प्रश्न
Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.
Advertisements
उत्तर
Potential Difference/Voltage (V) = 3 V
Resistance (R) = 5Ω
Current (I) = ?
According to Ohm's Law:
V = IR
Then I = `"V"/"R"`
I = `3/5`
= 0.6 A
APPEARS IN
संबंधित प्रश्न
Name the unit of electrical resistance and give its symbol.
Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:
(a) one-fourth
(b) four time
(c) half
(d) double
A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.
State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.
What length of copper wire of resistivity 1.7 × 10-8 Ω m and radius 1 mm is required so that its resistance is 2Ω?
Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other, and the rod P is removed. What will be the nature of charges on spheres A and B?

State the limitations of Ohm’s law.
State macroscopic form of Ohm’s law.
What is ohmic device?
Suppose there is a circuit consisting of only resistances and batteries and we have to double (or increase it to n-times) all voltages and all resistances. Show that currents are unaltered. Do this for circuit of Example 3.7 in the NCERT Text Book for Class XII.
