Science Answer the questions.[Phy-1M]

Write down the formula which states the relation between potential difference, current and resistance.

Write down the formula which relates electric charge, time and electric current.

Write down the formula for the heat produced when a current I is passed through a resistor R for time.

Write down an expression for the resistance of a metallic wire in terms of the resistivity.

Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.

Why should the resistance of:
A voltmeter be very large?

Why should the resistance of:
An ammeter be very small?

Why do electricians wear rubber hand gloves while working with electricity?

Why are copper and aluminium wires usually used for electricity transmission?

Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:

1. For decorating a hotel building from outside?
2. For lighting inside the rooms of the hotel?

Which quantity has the unit of watt?

Which quantity has the unit of watt?

Which particles constitute the electric current in a metallic conductor?

Which one has a higher electrical resistance: a 100 watt bulb or a 60 watt bulb?

Which of the two is connected in series: ammeter or voltmeter?

Which of the following equation shows the correct relationship between electrical units?
1A = 1C/ s or 1C = 1A/ s.

Which instrument is used to measure electric current? How should it be connected in a circuit?

Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?

Which electric heating devices in your home do you think have resistors which control the flow of electricity?

Which effect of current is utilised in the working of an electric fuse?

Which effect of current is utilised in an electric light bulb?

Which device is used to measure p.d.?

Which among iron and mercury is a better conductor of electricity?

What property of the filament wire accounts for this difference?

What is the unit of electric current?

What is the unit of electric charge?

What is the SI unit of potential difference?

What is the SI unit of (i) electric energy, and(ii) electric power?

What is the ratio of potential difference and current known as?

What is the meaning of the symbol kWh? Which quantity does it represent?

What is the general name of the substances having infinitely high electrical resistance?

What is the flow of charge called?

What is the current in a circuit if the charge passing each point is 20C in 40s?

What is nichrome? State its one use.

What is meant by saying that the potential difference between two points is 1 volt?

What is meant by saying that the electric potential at a point is 1 volt?

What happens to the resistance as the conductor is made thinner?

What happens to the resistance as the conductor is made thicker?

What happens to the other bulbs in a series circuit if one bulb blows off?

What happens to the other bulbs in a parallel circuit if one bulb blows off?

What do you understand by the term “potential difference”?

What do the letters p.d. stand for?

What do the following symbols mean in circuit diagrams?

What actually travels through the wires when you switch on a light`?

Two resistances X and Y are connected turn by turn:

1. In parallel, and
2. In series. In which case the resultant resistance will be less than either of the individual resistances?

Two exactly similar heating resistances are connected (i) in series, and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combinations, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer.

The graph between V and 1 for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
What should remain constant in a statement of this law?

The current passing through a room heater has been halved. What will happen to the heat produced by it?

State whether a voltmeter has a high resistance or a low resistance. Give reason for your answer.

State two factors on which the electrical energy consumed by an electrical appliance depends.