# ICSE Worksheet for chapter-17 Current Electricity class 9

## Find ICSE Worksheet for chapter-17 Current Electricity class 9

CLASS-9

BOARD: ICSE

Physics Worksheet - 17

TOPIC: Current Electricity

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

#### SUMMARY

• SOURCES OF DIRECT CURRENT
• ELECTRIC CURRENT
• SYMBOLS USED IN CIRCUIT DIAGRAMS
• SIMPLE ELECTRIC CIRCUIT
• INSULATORS AND CONDUCTORS
• CLOSED AND OPEN CIRCUITS

#### SECTION 1 – OBJECTIVE

1. Current in a circuit flows:
1. In a direction from high potential to low potential
2. In a direction from low potential to high potential
3. In a direction of flow of electrons
4. In any direction
2. The unit of potential difference is:
1. Ampere
2. Volt
3. Ohm
4. Coulomb
3. The correct relation is:
1. 1J = 1C / 1V
2. 1J = 1V / 1C
3. 1J = 1C x 1V
4. 1J x 1C x 1V = 1
4. On increasing the resistance in a circuit, current in it:
1. Decreases
2. Increases
3. Remains unchanged
4. Nothing can be said
5. Which of the following expression is correct?
1. R=VI
2. V=IR
3. R=I / V
4. I=R / V
6. What is the resistance offered by the filament of a bulb with potential difference of 12V & current 2A in a circuit?
1. 8 Ω
2. 9 Ω
3. 24 Ω
4. 6 Ω
7. In transferring 1.5 C charge through a metallic wire, 9J of work is needed. Find the potential difference across the wire
1. 6 V
2. 12 V
3. 18 V
4. 24 V
8. A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows is 24 Ω. Find the current drawn from the cell.
1. 0.5 A
2. 5 A
3. 0.2 A
4. 2 A
9. Find the odd man out
1. Impure water
2. Silver
3. Glass
4. Copper
10. 0.5 C charge passes through a section of a conductor in 5 s. find the current.
1. 0.1 A
2. 0.25 A
3. 0.025 A
4. None of these

#### SECTION II - SUBJECTIVE

1. Distinguish between primary & secondary cell.
2. Write symbols & state functions of each of following components in an electric circuit :
1. Key
2. Cell
3. Rheostat
4. Ammeter
5. Voltmeter
3. Two conductors A & B are joined by a copper wire. State the direction of flow of electrons in each of the following cases :
1. If A is positively charged & B is uncharged.
2. If A is negatively charged & B is uncharged.
3. If A is positively charged & B is negatively charged.
4. Explain the concept of electric potential difference in terms of work done in transferring the charge.
5. How is the resistance of a wire affected if its
1. Length is doubled