Direct and Alternating Current

Physics ⇒ Electricity and Magnetism

Direct and Alternating Current starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Direct and Alternating Current. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 10

A 12 V battery is connected to a 6 Ω resistor. Calculate the current flowing through the resistor.

A 9 V battery is connected to a circuit with a total resistance of 3 Ω. Calculate the current in the circuit.

A current of 2 A flows through a resistor of 5 Ω. What is the voltage across the resistor?

A household appliance is rated at 220 V, 50 Hz. What does 50 Hz indicate?

A student connects a light bulb to a battery. What type of current flows through the bulb?

Describe one use of direct current in everyday life.

Explain why AC is preferred over DC for transmission of electricity over long distances.

Is the current supplied by a solar panel direct or alternating?

Name one device that converts AC to DC.

State one advantage of using AC over DC for long-distance power transmission.

The peak value of an AC is 20 V. What is its rms value? (Use the relation V_rms = V_peak/√2)

The root mean square (rms) value of an AC is 10 A. What is its peak value? (Use the relation I_peak = √2 × I_rms)

What is the main difference between direct current and alternating current?