Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 9: Electricity

Work in pairs. Draw a circuit diagram with a cell, a lamp and a buzzer in series (all connected end-to-end).

Name the component used to measure current in circuits.

A cell, a lamp and a buzzer are connected in series. The current flowing through the lamp is 2 A. What is the current flowing through the buzzer? Assume the lamp and buzzer are both working properly. Give your answer in A.

A cell, a lamp and a buzzer are connected in series. What will happen to the lamp if the buzzer breaks?

A cell, a lamp and a buzzer are connected in series. What will happen to the buzzer if the lamp breaks?

Which of these describes the current through the cell in a parallel circuit? Write one letter.

Which of these are parallel circuits? Write the letter or letters that are correct. The diagrams from left to right are A, B, C and D.

A circuit is to be designed with a cell and four identical lamps. Draw a circuit diagram with four lamps connected in series with a cell.

A circuit is to be designed with a cell and four identical lamps. Draw a circuit diagram with four lamps connected in parallel with a cell.

Describe two advantages of connecting four identical lamps in parallel rather than in series with a cell.

Four identical lamps are connected in parallel. When all four lamps are working, the current through the cell is 2.0 A. Calculate the current through each lamp, in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Calculate the missing current, X, in this circuit. Give your answer in A.

Use three lamps, enough low-voltage cells to operate one lamp, wires and an ammeter. The three lamps are connected in parallel; A₁ measures the common-path current and A₂, A₃, A₄ measure the three branch currents. Work in groups of two or three. Set up the first circuit without the ammeter. When all lamps work, insert the ammeter at each of the four positions in turn and measure the current.