Brighter or dimmer? Changing cells and bulbs

Question 1

Two cells are used instead of one, but they are put in facing opposite ways. What happens to the bulb?

• A. It is twice as bright.
• B. It explodes.
• C. It does not light, because the cells push against each other.
• D. It changes colour.

Question 2

A series circuit has 2 cells and 2 bulbs. It is changed to 3 cells and 2 bulbs (all the same type). How bright is each bulb now?

• A. brighter than before
• B. the same as before
• C. dimmer than before

Question 3

True or false? A circuit diagram must show the colour of each wire.

• A. True
• B. False

Question 4

Two cells are used instead of one, but they are put in facing opposite ways. What happens to the bulb?

• A. It does not light, because the cells push against each other.
• B. It is twice as bright.
• C. It changes colour.
• D. It explodes.

Question 5

A series circuit has 2 cells and 2 bulbs. It is changed to 3 cells and 2 bulbs (all the same type). How bright is each bulb now?

• A. brighter than before
• B. the same as before
• C. dimmer than before

Question 6

True or false? The number of cells makes no difference to brightness.

• A. True
• B. False

Question 7

Which circuit symbol shows a cell?

• A. a long thin line next to a short thick line
• B. a straight line with a gap and a hinge
• C. a circle with a cross inside
• D. a zigzag line

Question 8

A series circuit has 3 cells and 1 bulb. It is changed to 4 cells and 1 bulb (all the same type). How bright is each bulb now?

• A. brighter than before
• B. the same as before
• C. dimmer than before

Question 9

True or false? The number of cells makes no difference to brightness.

• A. True
• B. False

Question 10

Why might a bulb blow if you add too many cells?

• A. Too much current makes the filament overheat and break.
• B. The cells get cold.
• C. The wires disappear.
• D. Bulbs only work with one cell.

Question 11

A series circuit has 1 cell and 2 bulbs. It is changed to 2 cells and 2 bulbs (all the same type). How bright is each bulb now?

• A. brighter than before
• B. the same as before
• C. dimmer than before

Question 12

True or false? Adding bulbs to a series circuit makes each bulb dimmer.

• A. True
• B. False

Question 13

Why might a bulb blow if you add too many cells?

• A. The cells get cold.
• B. Too much current makes the filament overheat and break.
• C. The wires disappear.
• D. Bulbs only work with one cell.

Question 14

A series circuit has 2 cells and 1 bulb. It is changed to 2 cells and 2 bulbs (all the same type). How bright is each bulb now?

• A. brighter than before
• B. the same as before
• C. dimmer than before

Question 15

True or false? Adding cells to a series circuit makes the bulbs brighter.

• A. True
• B. False

Question 16

Two cells are used instead of one, but they are put in facing opposite ways. What happens to the bulb?

• A. It does not light, because the cells push against each other.
• B. It is twice as bright.
• C. It changes colour.
• D. It explodes.