Ohm's Law (2)

The statement which correctly represents Ohm’s law:

• 1. V = IR

• 1. V = R/I

• 1. R = VI

• I = R/V

Ohms law defines current flow through _____ substance?

• Conducting

• Insulating

• Non conducting

• Both a and c

In ohms law ____ is directly proportional to resistance?

• Current

• Inductance

• Voltage

• All the above

A potential difference of 10 V is applied across a conductor whose resistance is 2.5 ohm. What is the value of current flowing through it?

• 1. 2 amperes

• 1. 4 amperes

• 1. 6 amperes

• 1. 10 amperes

When the length of the conductor is doubled and the area of cross-section remains the same then its resistance

• 1. Will be doubled

• 1. Will become half

• 1. Remains the same

• 1. Will increase by four times

Resistivity of Materials depend on

• Cross-section area

• material

• length of wire

• All of these

Which of the following materials is is not used as fuse material?

• Aluminum

• Silver

• Copper

• Carbon

Which material is expected to have the least resistivity

• copper

• lead

• mercury

• zinc

Electric bulb filaments are usually made out of

• Nichrome

• Tungsten

• Copper

Consider a circuit with two unequal resistance in parallel, then

• large current flows in large resistor

• current is same in both

• potential difference across each is same