Current of Electricity

What does 5A refer to?

• 5 Coulombs of charge flows through a point in 1 second

• 5V of electricity across 1 ohm of resistance

• 5V of electricity causing 1C of charge to flow

• 5C of charge flowing through a point

if 50C of charge flows though a point in 10 sec, what is the current passing through that point?

• 0.2A

• 5A

• 60A

• 500A

3J of energy is dissipated from a circuit when 6C of charge flows through the cell. What is the emf of the cell?

• 0.5V

• 2V

• 4V

• 18V

what is electromotive force?

• work done by an appliance in driving electrons round a circuit

• work done by source in driving a unit charge round a circuit

• work done to drive a unit charge through a component

• product of current and resistance

what is the resistance of the resistor in the circuit shown in the diagram?

• 0.5Ω

• 2Ω

• 3Ω

• 18Ω

What is the potential difference across the 2Ω resistor?

• 0.3 V

• 3V

• 4V

• 12V

a 2m long wire has a resistance of 16Ω. what is the resistance of this wire if it is 1m long?

• 4Ω

• 8Ω

• 32Ω

• 64Ω

a 2m long wire with a cross-section area of 1mm² has a resistance of 16Ω. What's the resistance of the same type of wire which is 4m long with a cross-section area of 2mm²?

• 4Ω

• 8Ω

• 16Ω

• 32Ω

An 8m long wire with a diameter of 3mm has a resistance of 16Ω. What is the resistance of the same type of wire which is 2m long with a diameter of 2mm?

• 2.7Ω

• 3.6Ω

• 6Ω

• 9Ω