1) Current and Circuit symbols:

What is electrical current?

The flow of electrical charge.

What unit is current measured in?

Ampere (A).

What must be present for current to flow?

A closed circuit and a source of potential difference.

Define potential difference (voltage) and its unit.

The driving force pushing charge around; measured in volts (V).

What is resistance and its unit?

Anything that opposes current flow; measured in ohms (Ω).

State the formula relating charge, current, and time.

Q=I×t, where Q is charge, I is current, and t is time.

Describe current flow in a single, closed-loop circuit.

Current is the same value throughout the circuit.

How does resistance affect current?

Higher resistance decreases current, given a constant potential difference.

What symbol represents a closed switch in a circuit diagram?

A line with a break closed by a small line segment.

Calculate the charge transferred when 8 A flows for 1.5 hours.

Q= 8 × (1.5×3600) = 43,200 C