Advertisements
Advertisements
Question
Distinguish between an open and a closed circuit.
Advertisements
Solution
An open circuit is an incomplete circuit and current does not flow through it, while a closed circuit is a complete circuit and current flows through it.
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
To increase the effective resistance in a circuit the resistors are connected in _____________.
<p> Define the unit of electric current (or Define ampere).
Write down the formula which relates electric charge, time and electric current
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
Find the effective resistance in the following circuit diagrams (Fig.):

A bulb marked 12 V, 24 W operates on a 12 V battery for 20 minutes. Calculate:
- The current flowing through it, and
- The energy consumed.
My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.
Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V 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.
An ammeter is always placed in parallel with the circuit.
Define the following:
Conventional current
