Grade 9 - Current Electricity and Resistance

Which one of the following best describes electric current?

• electric charges built on an object.

• how easy it is for current to flow in the circuit.

• flow of electrons, which are negatively charged particles.

Which one of the following show the components needed for a complete electric circuit?

• bulbs and wires.

• wires, bulb, and switch.

• wires, bulb, switch, battery.

• battery, wires, and switch.

Which one of the following is true for series circuit?

• the current is same everywhere in the circuit.

• each bulb can be controlled individually.

• if you add more bulbs, other bulbs are not affected.

• the current splits up in the circuit when it comes to junction.

A series circuit has two bulbs in it. One bulb is removed from it. What happens to the other bulb?

• Its brightness will increase.

• the bulb will not lit up.

• it will dim the brightness of light.

• the bulb brightness will remain the same.

Ammeter is connected in _________________ to measure the current flowing through a circuit.

• parallel

• across

• series

• across from the cell.

The ________________ across a cell is a measure of the energy provided by the cell.

• current

• ampere

• resistance

• voltage

In a parallel series, the current splits up when _____

• it continues in the straight path.

• it goes through electrical components.

• it comes to a junction.

What is the unit of resistance?

• ampere

• volts

• ohms

• newton

In parallel series, the voltages across all the components add up to the voltage across the cell.

Is this sentence true or false?

• True

• False

What will be the voltage across the electrical components?

• 3 V

• 6 V

• 12 V

• 3 V and 9 V