Science
Dynamic Electricity
Grade 9 · Middle School
Answer every question first, then press Finish to see your score and explanations.
- Question 1 of 20Easy
The SI unit of electric current is ...
- Question 2 of 20Easy
The unit of electrical resistance is ...
- Question 3 of 20Easy
The instrument used to measure electric current in a circuit is ...
- Question 4 of 20Easy
The instrument used to measure electric voltage is ...
- Question 5 of 20Easy
Ohm's law states that electric current is proportional to the ...
- Question 6 of 20Easy
The conventional direction of electric current is from the ... terminal to the ... terminal.
- Question 7 of 20Medium
A 20-ohm resistor is given a voltage of 10 volts. The current flowing through it is ...
- Question 8 of 20Medium
A current of 2 A flows through a 6-ohm resistor. The voltage across the resistor is ...
- Question 9 of 20Medium
A voltage of 12 V produces a current of 3 A in a resistor. The resistance of the resistor is ...
- Question 10 of 20Medium
Three resistors of 2 ohms, 3 ohms, and 5 ohms are connected in series. Their total resistance is ...
- Question 11 of 20Medium
Two resistors of 6 ohms and 3 ohms are connected in parallel. Their total resistance is ...
- Question 12 of 20Medium
The electrical energy used by a device of power P over a time t is given by ...
- Question 13 of 20Medium
An electrical device of 100 W runs for 5 hours. The electrical energy used is ...
- Question 14 of 20Medium
The resistance of a conducting wire depends on ...
- Question 15 of 20Hard
Two resistors of 4 ohms and 6 ohms are connected in series to a 20 V source. The current flowing is ...
- Question 16 of 20Hard
Resistors of 4 ohms and 6 ohms are connected in parallel to a 12 V source. The total current in the circuit is ...
- Question 17 of 20Hard
Two resistors R1 = 2 ohms and R2 = 4 ohms are connected in parallel. If the total current is 6 A, the current through R2 is ...
- Question 18 of 20Hard
A house uses four 20 W lamps for 5 hours and one 100 W television for 4 hours each day. The total electrical energy per day is ...
- Question 19 of 20Hard
Four identical resistors of 8 ohms each are connected in parallel. Their total resistance is ...
- Question 20 of 20Hard
Two identical lamps are connected in series, then in parallel to the same voltage source. The correct statement is ...