Ohm's Law

Q.

The device which shows the result after processing (a) output device (b) T. V. (c) input devices (d) pointer

Q.

Is current inversely proportional to the resistance?

Q.

The potential difference between the two points of a wire carrying 2 amperes current is 0.1 volt. Calculate the resistance between these points.

1. 0.05

2. 0.02

3. 0.01

4. zero

Q.

The formula (or mathematical expression) that represents Ohm's law is:-

1. $\frac{V}{I}=R$

2. Neither a nor b

3. V=IR

4. Both a and b

Q.

Ohm’s Law gives the relation between?

1. Voltage, Current

2. Voltage, Resistance

3. Voltage, Work

4. Current, Resistance

Q.

A small bulb has resistance $2ohms$ when it is cold. It draws $0.4ampere$ current from a source of $4volt$ and then starts glowing. Calculate the resistance when it is glowing

Q.

If the voltage across a fixed value of resistance is doubled, the current:

1. is halved

2. Stays the same

3. Not enough information

4. is doubled

Q.

What will be the energy consumed in 3 hours if an electric heater is rated at 1500 watt?

1. 4.5 kWh

2. 3 kWh

3. 2 kWh

4. 1.5 kWh

Q. Suppose in a house there are four bulbs of 100 W each, six of 60 W each and six of 40 W each. All of them are used for two hours a day. How many units of electricity will be used up in 30 days? How much will they have to pay at Rs. 2.80 /- per unit?

Q.

Why do we use a multiplier with a voltmeter

Q.

Ohm's Law describes the mathematical relationship between

1. Resistance, voltage and current

2. Heat and current

3. Ohm's Kilo-Ohms and mega-Ohms

4. Resistor size & resistor value

Q.

An electric lamp of resistance 20Ω and a conductor of resistance 4Ω are connected to a 6V battery as shown in the circuit. Calculate:
(a) The total resistance of the circuit
(b) The current through the circuit
(c)The potential difference across the (i) Electric lamp and (ii) Conductor, and
(d) Power of the lamp.

Q.

The law which gives the relation between electric potential difference and electric current is called:

1. Faraday's law
2. Oersted's law
3. Ohm's law
4. Newton's law

Q. Define power. What is the SI unit of power? An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb? [5 MARKS]

Q.

The graph given below is between current and voltage across a conductor.

From the graph, we can infer that the given conductor is in accordance with Ohm’s Law.

1. False

2. True

Q.

Draw a circuit diagram to verify Ohms law.

Q.

Ohm’s Law gives the relation between potential difference and current i.e, voltage is directly and linearly proportional to current.

1. True

2. False

Q. What's the difference between tangent galvanometer and a voltmeter?
what is the difference between measuring the strength of the electric current and measuring the electric current?

Q.

Two electric bulbs of 100 W each are used for 10 h per day in the month of September. If the price of one unit is 3 rs, then the electricity bill for two bulbs would be ______ rs.

1. 300

2. 380

3. 180

4. 280

Q.

How does a bridge circuit work?

Q. Suppose in a house there are five bulbs of $100W$ each, four of $60W$ each and six of $40W$ each. All of them are used for two hours a day. After $30$ days, how much will they have to pay at $Rs.3.0/-$per unit?

1. $Rs.168.0/-$
2. $Rs.171.2/-$
3. $Rs.174.0/-$
4. $Rs.174.6/-$

Q. An electric heater is rated at 1500 Watt. What would be the electrical energy consumed by it in 2 hours.

Q.

Define the commercial unit of electricity

Q. Nichrome and copper wires are connected across a power supply as shown below. If the cross sectional area of each wire is same, in which of the following options will the wire be the hottest?

1. 
2. 
3. 
4. 

Q. If the power rating of an electric bulb is 50 W, how much energy will it consume in 5 hours?

1. 250 units
2. 25 units
3. 0.25 units
4. 2.5 units

Q.

How much current will an electric geyser draw from a 220 V source, if the resistance of the geyser is $110\Omega$?

1. 4 Ampere

2. 2 Ampere

3. 1 Ampere

4. 8 Ampere

Q. Ohm’s law establishes the relationship between:

1. Length of the conductor and potential difference
2. Cross-sectional area of the conductor and potential difference
3. None of the above
4. Direct proportionality of current flowing through the conductor to the potential difference across the ends of the conductor

Q. Choose the correct relation between S, D and T.

1. S = D - T
2. S = D + T
3. S = D/T
4. S = D x T

Q. which quantity is kept constant for ohms law to be true?

Q. An electric heater is rated at 1500 Watt. What would be the electrical energy consumed by it in 2 hours.