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EJU Science: Physics - Waves and Electricity Flashcards

6 cards from real EJU practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Ohm's Law states that the current through a conductor is:

    Answer: Directly proportional to the voltage and inversely proportional to the resistance

    Ohm's Law: I = V/R, meaning current equals voltage divided by resistance.

  2. Two resistors of 4Ω and 6Ω are connected in series. What is the total resistance?

    Answer: 10Ω

    For resistors in series, total resistance R_total = R1 + R2 = 4 + 6 = 10Ω.

  3. Two resistors of 4Ω and 6Ω are connected in parallel. What is the total resistance?

    Answer: 2.4Ω

    For parallel resistors, 1/R = 1/4 + 1/6 = 5/12, so R = 12/5 = 2.4Ω.

  4. What is electric power (P) in terms of voltage (V) and current (I)?

    Answer: P = VI

    Electric power is calculated as P = VI, the product of voltage and current.

  5. In a DC circuit, what happens to the total current when an additional resistor is added in parallel?

    Answer: Total current increases because the equivalent resistance decreases

    Adding a parallel branch lowers total resistance, so by I = V/R, total current from the source increases.

  6. What is the SI unit of electric charge?

    Answer: Coulomb (C)

    The Coulomb (C) is the SI unit of electric charge, where one Coulomb equals the charge carried by approximately 6.24 × 10^18 electrons.