Level 3 - Electrical Science Principles

The following formula for Transformers represents ratios for what values on the primary and secondary windings?

• Voltage, number of turns and current

• Volume, number of seconds and current

• Voltage, number of turns and time

What makes the construction of a transformer?

• A laminated copper core with iron windings

• A laminated iron core with copper windings

• A laminated brass core with aluminium windings

What are the two types of losses in a transformer?

• Iron and copper losses

• Aluminium and copper losses

• Iron and brass losses

What are the two types of iron losses in a transformer?

• Current and heat

• Eddy currents and hysteresis

• Heat and power losses

What are three transformer cooling methods?

• Air, water and oil

• Air, water and gas

• Air, oil and gas

What are the three principles of space heating (electrical heating)?

• Warmth, insulation and energy efficiency

• Convection, conduction and radiation

• Convection, conduction and insulation

In lighting, what is the formula for the Inverse square law?

• E = I/d²

• I = E/d²

• E = d/d²

In the inverse square law, what does E signify?

E = I/d²

• Luminous intensity measured in candella (cd)

• Distance of light source above the surface in metres (m)

• Illuminance on the surface in lumens per metre² (lux)

In the inverse square law, what does I signify?

E = I/d²

• Luminous intensity in candella (cd)

• Distance of light source above the surface in metres (m)

• Illuminance on the surface in metre² (lux)

In the inverse square law, what does d signify?

E = I/d²

• Luminous intensity in candella (cd)

• Distance of light source above the surface in metres (m)

• Illuminance on the surface in lumens per metre² (lux)