Electricity

MULTIPLE CHOICE – 5 Quick Facts

  1. Static Electricity

    • Caused by extra positive or negative charges building up.

    • Opposites attract, like charges repel.

  3. Electrodes in a Wet Cell

    • A wet cell is a battery with liquid inside.

    • It has two electrodes: positive (cathode) and negative (anode).

  5. Calculating Resistance

    • Use Ohm’s Law:
      R = V ÷ I
      (Resistance = Voltage ÷ Current)

  7. Basic Circuit Parts

    • Battery (power)

    • Wires (path)

    • Load (like a bulb)

    • Switch (optional)

  9. Parallel Circuit

    • More than one path.

    • If one bulb goes out, others stay on.

    • Voltage is the same in each path.

MATCHING QUESTIONS – 15 Terms You Should Know

Term

What it means

Conductor

Lets electricity flow (e.g., metal)

Insulator

Stops electricity (e.g., rubber)

Voltage

Push that moves electricity (Volts)

Current

Flow of electricity (Amps)

Resistance

Slows current (Ohms)

Wet cell

Liquid battery

Dry cell

Paste battery (like AA)

Series circuit

One path

Parallel circuit

More than one path

Load

Uses electricity (e.g., bulb)

Resistor

Slows down current

Switch

Opens/closes the circuit

Static electricity

Charge build-up

Ground wire

Sends electricity safely into earth

Circuit

Complete path for electricity

WRITTEN PORTION – Know These Concepts

1.

Laws of Charges

  • Like charges repel, opposite charges attract.

2.

Circuit Components

  • Battery, wires, load (bulb), switch.

3.

Units of Electricity

  • Voltage = Volts (V)

  • Current = Amps (A)

  • Resistance = Ohms (Ω)

4.

Safety Tips

  • Don’t touch plugs with wet hands.

  • Don’t overload outlets.

  • Use power bars with switches.

  • Know where the breaker is.

5.

Ground Wire

  • Sends electricity into the ground if there’s a fault — helps prevent shock.

6.

Dry Cells

  • Alkaline (AA/AAA), Lithium, Button cell (small batteries).

7.

Electrons in Conductors vs Insulators

  • Conductors = electrons move freely.

  • Insulators = electrons are stuck.

8.

Variable Resistor

  • Changes how much resistance there is (like a dimmer or volume knob).

9.

Current vs Voltage vs Resistance

  • Current = how fast electricity flows.

  • Voltage = how hard it’s pushed.

  • Resistance = what slows it down.

10.

Series vs Parallel Circuits

  • Series = 1 path, if one thing breaks, all stop.

  • Parallel = many paths, if one breaks, others work.

11.

Ohm’s Law Practice

  • V = I × R

  • I = V ÷ R

  • R = V ÷ I