M15 Year 5 Electricity Revision

What is the name of this electrical energy source?

• Connecting wire

• Electric bulb

• Solar panel

• Circuit switch

Choose the true statement about these circuits.

• If one bulb in the left circuit blows, the other bulb continues to light.

• The right circuit allows electric current to flow through more than one path.

• Both bulbs in the right circuit are dimmer than the bulbs in the left circuit.

• The electric current in the left circuit splits into two paths before joining again.

What happens to the brightness of a bulb if we increase the number of dry cells in a series circuit?

• The bulb becomes brighter.

• The bulb becomes dimmer.

• The bulb's brightness does not change.

• The bulb will burn out immediately.

In a series circuit, adding more bulbs will cause ...

• each bulb to light more brightly.

• a short circuit to occur at the battery.

• all the bulbs to glow dimmer.

• no change to the bulbs' brightness.

In a parallel circuit, if more bulbs are added on new branches, what is the effect on the brightness of the original bulbs?

• The brightness of the bulbs remains the same.

• The bulbs become brighter.

• The bulbs become dimmer.

• The bulb in the first branch becomes brighter than those in the new branch.

What is the meaning of the following safety warning symbol?

• Warning: Electric Shock

• Warning: Poisonous Material

• Warning: Flammable

• Warning: Hot Surface

What happens to the electric circuit when the switch is in this position?

• Electric current still flows across the open switch and the bulb lights up.

• The battery will overheat because the circuit is broken.

• The bulb becomes brighter when the switch is turned off.

• The circuit becomes open (incomplete), so no electric current flows.

Ali built a simple electric circuit, but the bulb in the circuit did not light up. Which of the following is a possible reason the bulb does not light?

• The battery is connected correctly.

• The bulb is faulty or its filament is burnt out.

• Wires are firmly attached to both terminals of the bulb.

• The circuit's switch is closed (ON).

A student conducted an experiment to study the effect of number of batteries on the brightness of a bulb. What is the manipulated variable in this experiment?

• Number of bulbs

• Brightness of the bulb

• Type of circuit arrangement

• Number of dry cells

A circuit using 1 dry cell produces a dim bulb, whereas a similar circuit with 2 dry cells produces a bright bulb. What conclusion can be drawn from these results?

• The more dry cells used, the brighter the bulb glows.

• The fewer the dry cells, the brighter the bulb glows.

• The number of dry cells does not affect the bulb's brightness.

• The bulb's brightness varies randomly, unaffected by the number of cells.