2.2 Electric current and Potential Differences

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

• 0.15 A

• 3600 A

• 6.25 A

• 0.16 A

Voltage is measured in __.

• volts.
• watts.
• coulombs. 

When lighting happen,25 C charge is transferred from could to the ground and 1.25x10¹⁰ J energy is produced. Calculate the potential difference within cloud and the ground in unit Volt

• 4.00 x 10⁸

• 2.00 x 10⁸

• 3.00 x 10⁸

• 5.00 x 10⁸

What is the function of rheostat?

• To control the resistance in the circuit

• To control the potential difference in the circuit

• To control the current in the circuit

• To control the power in the circuit

............... state that the current flowing through an ohmic conductor is directly proportional to the potential difference across its end,provided that its temperature and the other physical conditions remain constant.

• Pressure Law

• Ohm’ s Law

• Charles Law

• Ohmic Law

Gradient of graph refer to

• Internal resistance

• External resistance

• Electromotive force

• Power

Resistance is defined as

• Ratio of potential difference to the current

• Ratio of current to the potential difference

Factors affecting resistance of the constantan wire except

• Temperature

• Length

• Cross-sectional area

• Type of material

• Current

Define electric current

• the total charge, Q flowing through the area per unit time, t.

• the total current, I flowing through the area per unit time, t.

• the rate of capacitance flow through a conductor.

• the rate of current flow through a conductor

From the equation, we know that the resistance of a conductor depends on..?

• length of conductor

• cross sectional area

• type of material

• volume of the wire