SP025 Chapter 3 Electric Current & Direct-Current Circuit (C1&C2

Current is define as?

• Total particle that flows through per time.

• Rate of flow of charge.

• Rate of flow of photon.

• Potential difference per resistance.

What is NOT characteristic of charge carrier in metal?

• Charge carrier is free electron.

• When there is no electric field the free electron move randomly.

• The free electron move with drift velocity.

• Free electron move from positive terminal to negative terminal.

What is the definition of Ohm’s Law? 

• Potential difference is proportional to current.

• Voltage is inversely proportional to current.

• Potential difference is proportional to resistance.

• Temperature must be changing.

Resistance does NOT depends on

• Area.

• Length of the wire.

• Resistivity.

• Current.

When the temperature of a metal increases, its electrical conductivity

• Increases because collision between electron and atoms increase.

• Increases because collision between electron and atoms decrease.

• Decreases because collision between electron and atoms increase.

• Constant because electron move as usual

What will happen if the temperature of metal increase?

• More electron will move.

• Drift velocity will increase.

• Resistance will be constant.

• Atoms will vibrate with bigger amplitude.

Emf is defined as

• Potential difference between battery.

• Energy provided by the source to each unit charge that flows through external and internal resistor.

• Current and resistance.

• Total voltage across the circuit.

Which is NOT TRUE about internal resistance?

• The longer you use it the bigger r.

• Depends on type of material .

• Depends on temperature.

• Depends on the total external resistance in the circuit.

Which of the following field derives Kirchhoff’s loop law?

• Short circuited

• Closed

• Opened

• Both A and B

Which among the following is a unit for electrical energy?

• Volt (V)

• Joule (J)

• Ohm

• Coloumb (C)