1. Y11 INTERVENTION : Electricity V=IR mains1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme

2. A cell / battery gives a direct current1.
5 mins 15 Y
V = IR
A cell / battery gives a direct current Or
X and Z are AC
V = 0.3 x15
4.5 V

3. Y11 INTERVENTION : Electricity V=IR mains1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme

4. 2. 10 mins The variable resistor increases/ decreases the current
which increases / decreases the
potential difference
The temperature of the bulb ( filament)
increases
Cost:
Hal cheaper to buy & cost more to run
LEDs Last longer ( less maintenance)
Power = IV
Energy efficiency:
LEDs are more (22% ) efficient
LEDs produce less heat
LEDs work with less current
Power = 3 x 12
Power = 36 W

5. 3. 5 mins V = I R V = R I 6 V = R 0.12 /1000A 50,000 ohm = R
Body fat / resistance changes
( depends on age, gender fitness, bone density)

6. Incorrect value of body fat is obtained
because
High water content changes body resistance
Cutting the cable causes a 100mA difference between Live and Neutral
The RCCB switches the current off
within 60 milliseconds
( very fast 1 mk only)
A residual current circuit breaker detects the
difference between LIVE and NEUTRAL
A fuse overheats and melts

7. Y11 INTERVENTION : Electricity V=IR mains1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme