Chapter 14 – Current Electricity

14 – Current Electricity

14 – Current Electricity

Current Electricity

Quiz

 

1. What is the SI unit of electric current?
   1.   . Volt
   2.   . Ohm
   3.   Ampere
   4.   Coulomb
2. • The unit of electrical resistance is:
   1.   . Volt
   2.   Ampere
   3.   . Ohm
   4.   . Watt
3. • In a series circuit, the total resistance is:
   1.   . The sum of the individual resistances
   2.   . The reciprocal of the sum of the reciprocals of the individual resistances
   3.   . The average of the individual resistances
   4.   . The product of the individual resistances
4. The power consumed in an electrical circuit is given by the formula
   1.   P=V×IP = V \times IP=V×I
   2.   P=V/IP = V / IP=V/I
   3.   P=I/VP = I / VP=I/V
   4.   . P=I2×RP = I^2 \times RP=I2×R
5. • If the voltage across a resistor is doubled and the resistance remains constant, the current:
   1.   . Doubles
   2.   . Halves
   3.   . Remains the same.
   4.   . Quadruples
6. The rate of flow of electric charge is known as:
   1.   Voltage
   2.   . Power
   3.   . Current
   4.   . Resistance
7. In a household electrical circuit, the devices are connected in:
   1.   . Series
   2.   . Parallel
   3.   Both series and parallel
   4.   . None of the above
8. • The energy consumed by an electrical device is given by:
   1.   . E=V×I×tE = V \times I \times tE=V×I×t
   2.   . E=V/I×tE = V / I \times tE=V/I×t
   3.   . E=I×R×tE = I \times R \times tE=I×R×t
   4.   . E=I2×R×tE = I^2 \times R \times tE=I2×R×t
9. • In a circuit with resistors in series, if one resistor fails, what happens to the circuit?
   1.   . The circuit remains closed
   2.   The circuit continues to work with reduced resistance
   3.   The circuit is broken and stops working
   4.   . The current increases
10. The electric power consumed by a resistor in a circuit is:
    1.   . Directly proportional to the current
    2.   . Directly proportional to the square of the current
    3.   . Inversely proportional to the current
    4.   . Inversely proportional to the square of the current