The power input to a motor is 10kW and the power output is 8kW.

Calculate:

• the losses
• the efficiency

Each correct response scores one mark.

P_LOSS = 

Efficiency % =  

Which of the following is deemed by AS/NZS 3000 to be a suitable method of protection against the damaging effects of overcurrent?

Where two dissimilar metals are in contact with one another in the presence of an electrolyte:

Match the typical applications listed below with the effects of electric current from the drop down boxes.

Each correct response scores one mark.

A 12 Ω resistor rated at 20W is connected directly across a 24V supply. The power dissipated will be:

A 330Ω resistor is to be connected to a 24V supply. What is the minimum power rating required for the resistor?

An electric oven has an element resistance of 15 Ω. What is the oven’s power rating when supplied at 230V?

P= 

Electric current in a solid conductor is a movement of electrons through the conductor. During this process, whenever electrons collide with atoms and ions in the conductor it results in:

To determine the power consumed in a d.c. circuit you would need to multiply the readings of:

Which of the following are all typical physiological effects of electric current?