Electricity Review Worksheet
| # | Answer |
|---|---|
| 1 | Electric charge is a property of matter that causes it to experience electric forces and interact through electricity. |
| 2 | The two types of electric charge are positive and negative. |
| 3 | Electrons carry a negative charge. |
| 4 | Protons carry a positive charge. |
| 5 | Static electricity is a buildup of electric charge on an object, while current electricity is the continuous flow of charge through a conductor. |
| 6 | An electric current is the flow of electric charge, usually through a wire or another conductor. |
| 7 | The SI unit for electric current is the ampere, or amp. |
| 8 | Voltage is the electric potential difference between two points, and it measures the energy available to move charge. |
| 9 | Electrical resistance is the opposition a material offers to the flow of electric current. |
| 10 | The SI unit of resistance is the ohm, symbolized by the Greek letter omega, Ω. |
| 11 | Ohm’s law states that voltage equals current multiplied by resistance: V = IR. |
| 12 | Using Ohm’s law, I = V/R = 12/4 = 3 A. |
| 13 | Using Ohm’s law, V = IR = 2 × 10 = 20 V. |
| 14 | Electrical power is the rate at which electrical energy is converted or used in a circuit. |
| 15 | The formula is P = IV. |
| 16 | Using P = IV, power = 3 × 120 = 360 W. |
| 17 | In a series circuit, components are connected in one path so the same current flows through each part. In a parallel circuit, components are connected in separate branches so current has multiple paths. |
| 18 | The entire circuit stops working because the path is broken. |
| 19 | Homes use parallel circuits so each appliance can operate independently and receive the same supply voltage. |
| 20 | A conductor is a material that allows electric charges to flow easily. Copper is one example. |
| 21 | An insulator is a material that resists the flow of electric charge. Plastic is one example. |
| 22 | Copper is commonly used because it has low resistance and conducts electricity very well. |
| 23 | A switch opens or closes a circuit to stop or allow current to flow. |
| 24 | A light bulb transforms electrical energy mainly into light energy and thermal energy. |
| 25 | Using Ohm’s law, V = IR = 5 × 6 = 30 V. |
| 26 | Using Ohm’s law, R = V/I = 24/3 = 8 Ω. |
| 27 | Electrical energy = power × time = 100 × 2 = 200 Wh. |
| 28 | A fuse or circuit breaker protects a circuit by stopping current when it becomes too large. |
| 29 | A short circuit is dangerous because it creates a very low-resistance path, causing excessive current that can overheat wires and start fires. |
| 30 | If voltage stays the same, increasing resistance decreases current because Ohm’s law states I = V/R. As resistance rises, the current must fall. |