This document contains 9 questions related to electrical circuit calculations. The questions involve calculating current, resistance, potential difference, power and charge given various component values in different circuits. Calculations include determining simpler representations of values, calculating resistance from given current and potential difference, finding potential difference for a given current and resistance, and calculating current, power and charge in circuits with known component values.

1. 1. What
is
a
simpler
way
of
expressing:
(i)
0.000
005
A
and
(ii)
3
000
000
V?
2. A
potential
difference
(p.d)
of
6V
causes
a
current
of
0.6
A
in
a
conductor.
Calculate
the
resistance
of
the
conductor.
3. Find
the
p.d
required
to
pass
a
current
of
5A
through
a
conductor
having
resistance=8
Ohms.
4. A
960
Ohms
lamp
is
connected
to
a
240V
supply.
Calculate
the
current
in
the
lamp
and
its
power
consumption.
5. A
p.d
of
1.35V
causes
a
current
of
465
micro-­‐Amperes
to
flow
in
a
conductor.
Calculate
the
resistance
of
the
conductor.
6. An
accidental
short
circuit
to
a
240V
supply
is
caused
by
the
connection
of
a
component
of
8.5
milli-­‐Ohms
across
the
supply
terminals.
What
will
be
the
short
circuit
current?
7. What
is
the
voltage
across
an
electric
heater
of
5-­‐Ohms
through
which
passes
a
current
of
22A?
8. A
p.d
of
12V
is
applied
to
a
7.5-­‐Ohms
resistor
for
a
period
of
5
seconds.
Calculate
the
electric
charge
(in
Coulombs)
transferred
in
this
time
period.
9. A
voltage
of
20V
is
required
to
cause
a
current
of
2A
to
flow
in
a
resistor
of
resistance
10-­‐Ohms.
What
voltage
will
be
required
to
flow
the
same
amount
of
current
if
the
resistance
were
40-­‐Ohms.