High school physics electricity review questions and answers PDF.

⚡ Quick Study Guide

• ⚛️ Electric Charge: Measured in Coulombs (C). Two types: positive and negative. Like charges repel, opposite charges attract.
• 💡 Electric Current: The rate of flow of electric charge. Formula: $I = \frac{\Delta Q}{\Delta t}$, where I is current (in Amperes), $\Delta Q$ is the change in charge (in Coulombs), and $\Delta t$ is the change in time (in seconds).
• 🚧 Voltage (Electric Potential Difference): The work done per unit charge to move a charge between two points. Formula: $V = \frac{W}{Q}$, where V is voltage (in Volts), W is work (in Joules), and Q is charge (in Coulombs).
• 📏 Resistance: Opposition to the flow of current. Measured in Ohms (Ω).
• 🌡️ Ohm's Law: Relates voltage, current, and resistance: $V = IR$, where V is voltage, I is current, and R is resistance.
• ➕ Series Circuits: Components are connected one after another. The current is the same through each component. Total resistance: $R_{total} = R_1 + R_2 + R_3 + ...$
• ➗ Parallel Circuits: Components are connected side by side. The voltage is the same across each component. Total resistance: $\frac{1}{R_{total}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + ...$
• 🔋 Electric Power: The rate at which electrical energy is transferred. Formula: $P = VI = I^2R = \frac{V^2}{R}$, where P is power (in Watts).

✍️ Practice Quiz

1. Which of the following is the unit of electric charge?
   1. (A) Volt
   2. (B) Ampere
   3. (C) Coulomb
   4. (D) Ohm
2. What does Ohm's Law state?
   1. (A) $I = VR$
   2. (B) $V = IR$
   3. (C) $R = VI$
   4. (D) $V = I/R$
3. In a series circuit with two resistors, $R_1 = 10\ \Omega$ and $R_2 = 20\ \Omega$, what is the total resistance?
   1. (A) $10\ \Omega$
   2. (B) $20\ \Omega$
   3. (C) $30\ \Omega$
   4. (D) $2\ \Omega$
4. In a parallel circuit, if the voltage across one resistor is 12V, what is the voltage across another resistor in the same parallel circuit?
   1. (A) 6V
   2. (B) 24V
   3. (C) 12V
   4. (D) Dependent on the resistance
5. What is the formula for electric power in terms of voltage (V) and current (I)?
   1. (A) $P = \frac{V}{I}$
   2. (B) $P = VI$
   3. (C) $P = \frac{I}{V}$
   4. (D) $P = V + I$
6. If a circuit has a voltage of 9V and a resistance of 3\ \Omega, what is the current flowing through it?
   1. (A) 27A
   2. (B) 3A
   3. (C) 1/3 A
   4. (D) 6A
7. What happens to the total resistance when you add more resistors in parallel?
   1. (A) Increases
   2. (B) Decreases
   3. (C) Stays the same
   4. (D) Doubles