Main Electricity

AC stands for ________ current

DC stands for ________ current

The potential difference of mains electricity is _______ volts.

Which type of current only flows in 1 direction around a circuit?

• Direct Current (DC)

• Alternating Current (AC)

Which type of current goes back and forth in a circuit?

• Alternating Current (AC)

• Direct Current (DC)

AC or DC?

• AC

• DC

AC or DC?

• AC

• DC

Which of these equations is correct?

• $frequency\ =\ \frac{1}{time\ period\ },\ f=\frac{1}{T}$

• $frequency\ =\ \frac{time\ period}{1},\ f=\frac{T}{1}$

• $frequency\ =\ time\ period\ \times\ 1$

• $frequency\ =\ time\ period\ +\ 1$

The unit of frequency is ______

• Hertz (Hz)

• Seconds (s)

• Volts (V)

• Ohms ( $\Omega$ )

Which number points to the Live Wire

• 1

• 2

• 3

• 4

• 5